Electric Field & Dipole

 

Electric Field & Dipole

1 MARKS QUESTION 👀

1. What is an electric field?

Answer: Region around a charge where force is experienced.
Explanation: Other charges feel force in this region.

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2. What is electric field intensity?

Answer: Force per unit charge.
Explanation: Measures strength of field.

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3. Write formula for electric field.

Answer:
$E=\frac{F}{q}$
Explanation: $F$ = force, $q$ = charge.

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4. What is SI unit of electric field?

Answer: N/C
Explanation: Newton per Coulomb.

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5. What is direction of electric field?

Answer: Direction of force on positive charge.
Explanation: Standard convention.

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6. What is electric field due to point charge?

Answer: Field around a charged particle.
Explanation: Decreases with distance.

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7. Write formula for electric field due to point charge.

Answer:

$E=k\frac{q}{r^2}$

$q_1$

$q_2$

$r$

$F=k\frac{q_1{q}_2}{r^2}\approx -5.06$

Charge and distance sliders update Coulomb force magnitude and direction.

Explanation: Inverse square relation.

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8. What is direction of field for positive charge?

Answer: Outward
Explanation: Away from charge.

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9. What is direction for negative charge?

Answer: Inward
Explanation: Towards charge.

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10. What is superposition principle of electric field?

Answer: Net field is vector sum of fields.
Explanation: Fields add vectorially.

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11. What are electric field lines?

Answer: Imaginary lines showing field direction.
Explanation: Represent field pattern.

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12. Do field lines intersect?

Answer: No
Explanation: Direction cannot be two at a point.

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13. What is uniform electric field?

Answer: Same magnitude and direction everywhere.
Explanation: Example: parallel plates.

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14. What is non-uniform electric field?

Answer: Field varies with position.
Explanation: Example: point charge.

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15. What is electric dipole?

Answer: Pair of equal and opposite charges.
Explanation: Separated by small distance.

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16. What is dipole moment?

Answer: Product of charge and separation.
Explanation: Vector quantity.

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17. Write formula for dipole moment.

Answer:
$p=q\times d$
Explanation: $d$ = separation distance.

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18. What is unit of dipole moment?

Answer: C·m
Explanation: Coulomb meter.

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19. What is direction of dipole moment?

Answer: From negative to positive charge
Explanation: Defined direction.

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20. What is electric field on axial line of dipole?

Answer: Strong
Explanation: Fields add up.

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21. What is electric field on equatorial line?

Answer: Weak
Explanation: Fields partially cancel.

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22. What is torque on dipole?

Answer: Turning effect in field.
Explanation: Aligns dipole.

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23. Write formula for torque.

Answer:
$\tau =pE\sin \theta$
Explanation: Depends on angle.

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24. When is torque maximum?

Answer: At ${90}^{\circ }$
Explanation: $\sin {90}^{\circ }=1$

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25. When is torque zero?

Answer: At $0^{\circ }$ or ${180}^{\circ }$
Explanation: Dipole aligned.

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26. What is stable equilibrium of dipole?

Answer: Along electric field
Explanation: Minimum energy.

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27. What is unstable equilibrium?

Answer: Opposite to field
Explanation: Maximum energy.

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28. What is electric potential due to dipole?

Answer: Varies with position
Explanation: Depends on distance.

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29. What is potential on equatorial line?

Answer: Zero
Explanation: Contributions cancel.

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30. What is electric field at center of dipole?

Answer: Zero
Explanation: Symmetry.

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31. What is nature of dipole field lines?

Answer: Curved
Explanation: Combined effect.

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32. What is relation between field and distance in dipole?

Answer: Decreases rapidly
Explanation: $\propto \frac{1}{r^3}$

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33. What is electric field inside conductor?

Answer: Zero
Explanation: Charges cancel field.

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34. What is electric field just outside conductor?

Answer: Non-zero
Explanation: Due to surface charge.

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35. What is relation between force and field?

Answer:
$F=qE$
Explanation: Field produces force.

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36. What is test charge?

Answer: Small positive charge
Explanation: Used to detect field.

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37. What is field strength at large distance?

Answer: Weak
Explanation: Decreases with distance.

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38. What is field strength near charge?

Answer: Strong
Explanation: Inverse square.

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39. What is electric field vector nature?

Answer: Vector quantity
Explanation: Has direction and magnitude.

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40. What is electric field scalar property?

Answer: None
Explanation: It is vector.

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41. What is direction of force on negative charge?

Answer: Opposite to field
Explanation: Due to negative sign.

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42. What is electric field in parallel plate capacitor?

Answer: Uniform
Explanation: Constant field.

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43. What is relation between dipole and field?

Answer: Dipole experiences torque
Explanation: Interaction with field.

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44. What is energy of dipole in field?

Answer: Depends on angle
Explanation: Position dependent.

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45. What is electric field due to dipole at far point?

Answer: Very small
Explanation: Decreases rapidly.

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46. What is dipole alignment in field?

Answer: Along field
Explanation: Stable position.

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47. What is effect of increasing dipole moment?

Answer: Torque increases
Explanation: $\tau \propto p$

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48. What is effect of increasing field strength?

Answer: Torque increases
Explanation: $\tau \propto E$

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49. What is electric field unit alternative?

Answer: V/m
Explanation: Equivalent unit.

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50. What is importance of electric field?

Answer: Explains force without contact
Explanation: Fundamental concept.

51. What is electric field due to infinite line charge dependence?

Answer: Inversely proportional to distance
Explanation: $E\propto \frac{1}{r}$

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52. What is electric field due to infinite plane sheet?

Answer: Constant
Explanation: Independent of distance.

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53. What is direction of field near positive plate?

Answer: Away from plate
Explanation: Positive charges repel.

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54. What is direction near negative plate?

Answer: Towards plate
Explanation: Negative charges attract.

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55. What is electric field inside hollow conductor?

Answer: Zero
Explanation: Electrostatic shielding.

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56. What is electric field at surface of conductor?

Answer: Perpendicular
Explanation: No tangential component.

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57. What is field strength proportional to?

Answer: Charge
Explanation: $E\propto q$

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58. What is field strength inversely proportional to?

Answer: Square of distance
Explanation: $E\propto \frac{1}{r^2}$

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59. What is field direction for dipole on axial line?

Answer: Along dipole moment
Explanation: Fields add up.

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60. What is field direction on equatorial line?

Answer: Opposite to dipole moment
Explanation: Net field reverses.

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61. What is dipole moment if distance increases?

Answer: Increases
Explanation: $p=qd$

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62. What happens if charge increases in dipole?

Answer: Dipole moment increases
Explanation: Direct relation.

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63. What is field at large distance from dipole?

Answer: Very small
Explanation: $\propto \frac{1}{r^3}$

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64. What is torque direction on dipole?

Answer: Tends to align with field
Explanation: Rotational effect.

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65. What is potential energy minimum when?

Answer: Dipole aligned with field
Explanation: Stable equilibrium.

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66. What is potential energy maximum when?

Answer: Opposite to field
Explanation: Unstable equilibrium.

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67. What is electric field due to dipole on axial line formula?

Answer:
$E=\frac{1}{4\pi {\epsilon }_0}\frac{2p}{r^3}$
Explanation: Stronger field on axial line.

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68. What is electric field on equatorial line formula?

Answer:
$E=\frac{1}{4\pi {\epsilon }_0}\frac{p}{r^3}$
Explanation: Weaker than axial.

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69. What is ratio of axial to equatorial field?

Answer: 2 : 1
Explanation: Axial field is double.

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70. What is field line density represent?

Answer: Field strength
Explanation: Closer lines → stronger field.

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71. What is electric field lines nature?

Answer: Continuous
Explanation: Do not break.

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72. What is electric field lines start from?

Answer: Positive charge
Explanation: Originate outward.

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73. What is electric field lines end at?

Answer: Negative charge
Explanation: Terminate inward.

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74. What is field inside charged sphere?

Answer: Zero
Explanation: Charges on surface.

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75. What is field outside charged sphere?

Answer: Like point charge
Explanation: Acts from center.

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76. What is dipole behavior in uniform field?

Answer: Rotates only
Explanation: No net force.

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77. What is dipole behavior in non-uniform field?

Answer: Moves and rotates
Explanation: Net force exists.

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78. What is electric field magnitude always?

Answer: Positive
Explanation: Direction separate.

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79. What is electric field vector nature?

Answer: Vector quantity
Explanation: Has direction.

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80. What is force on charge in field?

Answer:
$F=qE$
Explanation: Basic relation.

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81. What is direction of force on positive charge?

Answer: Along field
Explanation: Same direction.

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82. What is direction on negative charge?

Answer: Opposite to field
Explanation: Due to negative sign.

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83. What is electric field unit derived from force?

Answer: N/C
Explanation: From $F\mathrm{/}q$

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84. What is alternative unit of field?

Answer: V/m
Explanation: Equivalent unit.

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85. What is electric field of ring at center?

Answer: Zero
Explanation: Symmetry.

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86. What is potential at center of dipole?

Answer: Zero
Explanation: Equal and opposite charges.

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87. What is field due to infinite plane sheet?

Answer: Uniform
Explanation: Constant everywhere.

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88. What is electric field at sharp points?

Answer: Very high
Explanation: Charge concentration.

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89. What is electric field effect in lightning?

Answer: Causes discharge
Explanation: High field strength.

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90. What is dipole in real life example?

Answer: Molecules like water
Explanation: Have polarity.

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91. What is effect of dipole moment on field?

Answer: Larger field
Explanation: Stronger dipole.

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92. What is electric field behavior at infinity?

Answer: Zero
Explanation: No influence.

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93. What is field symmetry for isolated charge?

Answer: Spherical
Explanation: Same in all directions.

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94. What is field nature in 3D?

Answer: Radial
Explanation: Outward/inward.

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95. What is dipole field nature?

Answer: Non-uniform
Explanation: Varies with position.

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96. What is electric field between plates?

Answer: Uniform
Explanation: Parallel plates.

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97. What is energy stored in dipole-field system?

Answer: Depends on angle
Explanation: Orientation dependent.

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98. What is effect of increasing field on dipole?

Answer: Torque increases
Explanation: $\tau \propto E$

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99. What is effect of increasing dipole moment?

Answer: Torque increases
Explanation: $\tau \propto p$

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100. What is summary of electric field concept?

Answer: Region where charge experiences force
Explanation: Fundamental electrostatics idea.

101. What is electric field at infinite distance?

Answer: Zero
Explanation: No influence far away.

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102. What is field due to uniformly charged ring on axis?

Answer: Non-zero
Explanation: Depends on position.

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103. What is electric field direction on axis of ring?

Answer: Along axis
Explanation: Due to symmetry.

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104. What is electric field at center of ring?

Answer: Zero
Explanation: Symmetry cancels forces.

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105. What is electric field due to dipole at very far point?

Answer: Very small
Explanation: $\propto \frac{1}{r^3}$

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106. What is field inside charged conductor?

Answer: Zero
Explanation: Electrostatic equilibrium.

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107. What is field at surface of conductor?

Answer: Perpendicular
Explanation: No tangential component.

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108. What is field outside conductor?

Answer: Non-zero
Explanation: Due to surface charge.

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109. What is field direction for radial symmetry?

Answer: Radial
Explanation: From center.

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110. What is electric field vector addition rule?

Answer: Vector sum
Explanation: Superposition.

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111. What is electric field at midpoint of dipole?

Answer: Along dipole axis
Explanation: Net field exists.

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112. What is potential difference related to field?

Answer:
$E=-\frac{dV}{dx}$
Explanation: Field is gradient of potential.

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113. What is field in uniform region?

Answer: Constant
Explanation: Same everywhere.

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114. What is field due to infinite line charge formula?

Answer:

$$E=\frac{\lambda }{2\pi {\epsilon }_{0}r}$$

Explanation: $\lambda$ = charge density.

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115. What is field due to plane sheet formula?

Answer:

$$E=\frac{\sigma }{2{\epsilon }_0}$$

Explanation: Constant field.

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116. What is field direction near conductor?

Answer: Normal to surface
Explanation: Perpendicular.

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117. What is field behavior at sharp edges?

Answer: Very high
Explanation: Charge concentration.

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118. What is electric dipole axis?

Answer: Line joining charges
Explanation: Reference line.

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119. What is dipole length?

Answer: Distance between charges
Explanation: Small separation.

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120. What is dipole field nature?

Answer: Non-uniform
Explanation: Varies with distance.

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121. What is electric field energy density?

Answer:
$u=\frac{1}{2}{\epsilon }_0{E}^2$
Explanation: Energy per unit volume.

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122. What is field direction on equatorial line?

Answer: Opposite to dipole moment
Explanation: Net effect.

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123. What is field direction on axial line?

Answer: Along dipole moment
Explanation: Fields add.

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124. What is relation between field and distance for dipole?

Answer: Inverse cube
Explanation: $\propto \frac{1}{r^3}$

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125. What is field at very near dipole?

Answer: Strong
Explanation: Close distance.

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126. What is electric field in vacuum?

Answer: Maximum effect
Explanation: No medium reduction.

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127. What is effect of dielectric on field?

Answer: Reduces field
Explanation: Polarization effect.

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128. What is field due to charged sphere outside?

Answer: Like point charge
Explanation: Center acts as source.

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129. What is field inside charged sphere?

Answer: Zero
Explanation: Charges on surface.

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130. What is dipole torque zero condition?

Answer: $\theta =0^{\circ }$ or ${180}^{\circ }$
Explanation: Alignment.

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131. What is dipole torque maximum condition?

Answer: ${90}^{\circ }$
Explanation: Maximum rotation.

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132. What is electric field direction given by?

Answer: Tangent to field lines
Explanation: Direction indicator.

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133. What is field lines spacing indicate?

Answer: Field strength
Explanation: Closer → stronger.

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134. What is dipole potential at axial line?

Answer: Non-zero
Explanation: Depends on distance.

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135. What is dipole potential at equatorial line?

Answer: Zero
Explanation: Cancellation.

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136. What is electric field unit relation?

Answer: N/C = V/m
Explanation: Equivalent units.

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137. What is field behavior at large distance?

Answer: Weak
Explanation: Decreases.

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138. What is field behavior near charge?

Answer: Strong
Explanation: Inverse square.

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139. What is field symmetry around charge?

Answer: Spherical
Explanation: Same in all directions.

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140. What is dipole symmetry?

Answer: Cylindrical
Explanation: Around axis.

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141. What is field due to two equal charges at midpoint?

Answer: Zero
Explanation: Opposite directions cancel.

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142. What is field due to unequal charges at midpoint?

Answer: Non-zero
Explanation: Imbalance.

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143. What is electric field concept based on?

Answer: Force per unit charge
Explanation: Fundamental definition.

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144. What is field independent of?

Answer: Test charge
Explanation: Property of source.

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145. What is dipole energy minimum position?

Answer: Along field
Explanation: Stable.

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146. What is dipole energy maximum position?

Answer: Opposite field
Explanation: Unstable.

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147. What is field due to infinite sheet nature?

Answer: Uniform
Explanation: Constant everywhere.

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148. What is electric field at boundary?

Answer: Changes normal component
Explanation: Boundary condition.

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149. What is tangential component of field at boundary?

Answer: Continuous
Explanation: Does not change.

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150. What is summary of dipole?

Answer: Pair of equal and opposite charges
Explanation: Basic electrostatic system.

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151. What is electric field at midpoint of two equal like charges?

Answer: Zero
Explanation: Fields cancel due to symmetry.

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152. What is electric field at midpoint of opposite charges?

Answer: Non-zero
Explanation: Fields add up.

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153. What is electric field inside a cavity of conductor?

Answer: Zero
Explanation: Shielding effect.

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154. What is electric field just outside conductor?

Answer: Perpendicular to surface
Explanation: Due to surface charges.

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155. What is field due to dipole proportional to?

Answer: Dipole moment
Explanation: $E\propto p$

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156. What is field due to dipole inversely proportional to?

Answer: Cube of distance
Explanation: $\propto \frac{1}{r^3}$

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157. What is electric field on axial line strongest at?

Answer: Near dipole
Explanation: Distance small.

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158. What is electric field on equatorial line weakest at?

Answer: Far from dipole
Explanation: Decreases rapidly.

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159. What is direction of dipole moment vector?

Answer: From negative to positive
Explanation: Standard convention.

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160. What is electric field unit dimension?

Answer: $[ML{T}^{-3}{A}^{-1}]$
Explanation: Derived unit.

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161. What is electric field due to spherical shell inside?

Answer: Zero
Explanation: Symmetry.

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162. What is electric field outside spherical shell?

Answer: Like point charge
Explanation: Center acts as source.

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163. What is field direction due to positive charge?

Answer: Outward radial
Explanation: Repulsion.

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164. What is field direction due to negative charge?

Answer: Inward radial
Explanation: Attraction.

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165. What is electric field at infinite plane?

Answer: Constant
Explanation: Independent of distance.

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166. What is electric field inside capacitor?

Answer: Uniform
Explanation: Between plates.

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167. What is electric field outside capacitor plates?

Answer: Nearly zero
Explanation: Field confined.

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168. What is dipole torque formula again?

Answer:
$\tau =pE\sin \theta$
Explanation: Rotational effect.

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169. What is dipole energy formula?

Answer:

$$U=-pE\cos \theta$$

Explanation: Depends on angle.

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170. What is stable position of dipole?

Answer: Parallel to field
Explanation: Minimum energy.

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171. What is unstable position of dipole?

Answer: Anti-parallel
Explanation: Maximum energy.

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172. What is electric field strength maximum where?

Answer: Near charge
Explanation: Inverse square.

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173. What is electric field minimum where?

Answer: Far from charge
Explanation: Weak field.

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174. What is electric field lines density meaning?

Answer: Field strength
Explanation: Denser → stronger.

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175. What is electric field lines direction?

Answer: Tangent gives direction
Explanation: Direction indicator.

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176. What is electric field concept based on?

Answer: Force per unit charge
Explanation: Definition.

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177. What is electric field independent of?

Answer: Test charge
Explanation: Property of source.

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178. What is dipole formed by?

Answer: Equal and opposite charges
Explanation: Small separation.

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179. What is dipole axis?

Answer: Line joining charges
Explanation: Reference axis.

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180. What is dipole center?

Answer: Midpoint of charges
Explanation: Central point.

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181. What is field due to dipole symmetry?

Answer: Cylindrical
Explanation: Around axis.

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182. What is electric field in vacuum vs medium?

Answer: Reduced in medium
Explanation: Due to dielectric.

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183. What is field behavior at sharp edges?

Answer: High
Explanation: Charge concentration.

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184. What is electric field in hollow sphere?

Answer: Zero inside
Explanation: Charges on surface.

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185. What is electric field in solid sphere (uniform)?

Answer: Varies with radius
Explanation: Depends on distribution.

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186. What is electric field nature near dipole?

Answer: Non-uniform
Explanation: Changes rapidly.

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187. What is electric field nature far from dipole?

Answer: Weak and uniform-like
Explanation: Small variation.

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188. What is dipole interaction with field?

Answer: Experiences torque
Explanation: Alignment tendency.

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189. What is dipole interaction in non-uniform field?

Answer: Force + torque
Explanation: Movement occurs.

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190. What is electric field direction in space?

Answer: Radial or curved
Explanation: Depends on source.

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191. What is electric field for line charge shape?

Answer: Cylindrical symmetry
Explanation: Around line.

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192. What is electric field for plane sheet symmetry?

Answer: Planar symmetry
Explanation: Same everywhere.

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193. What is electric field important for?

Answer: Explaining force action
Explanation: Field concept.

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194. What is electric field cause?

Answer: Electric charges
Explanation: Source of field.

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195. What is dipole moment zero condition?

Answer: Charges overlap
Explanation: Distance zero.

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196. What is electric field relation to energy?

Answer: Stores energy
Explanation: Field energy exists.

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197. What is electric field energy density formula?

Answer:
$u=\frac{1}{2}{\epsilon }_0{E}^2$
Explanation: Energy per volume.

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198. What is electric field strength near sharp conductor?

Answer: Very high
Explanation: Used in lightning rods.

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199. What is electric field in electrostatics condition?

Answer: Time-independent
Explanation: Static charges.

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200. What is final summary of Electric Field & Dipole?

Answer: Field represents force and dipole represents charge pair interaction
Explanation: Core concept of electrostatics.

1. Electrostatics 👈🕮 👉👊Electrostatics - Important Formulas Table👌 1 MARKS QUESTION 👀     1. Electric Charge & Properties     2. Coulomb’s Law