Magnetic Effects of Electric Current
Fleming's Left-Hand Rule
Class 10 Science | CBSE | Foundation | Competitive Preparation
✋ Fleming's Left-Hand Rule
1. Introduction | परिचय
English:
Fleming's Left-Hand Rule is used to determine the direction of force or motion experienced by a current-carrying conductor placed in a magnetic field.
हिन्दी:
फ्लेमिंग का बायाँ हाथ नियम चुंबकीय क्षेत्र में रखे धारा-वाहक चालक पर लगने वाले बल अथवा उसकी गति की दिशा ज्ञात करने के लिए प्रयोग किया जाता है।
Fleming's Left-Hand Rule is used to determine the direction of force or motion experienced by a current-carrying conductor placed in a magnetic field.
हिन्दी:
फ्लेमिंग का बायाँ हाथ नियम चुंबकीय क्षेत्र में रखे धारा-वाहक चालक पर लगने वाले बल अथवा उसकी गति की दिशा ज्ञात करने के लिए प्रयोग किया जाता है।
Important: The three directions — magnetic field, current and force — are mutually perpendicular to each other.
महत्वपूर्ण: चुंबकीय क्षेत्र, धारा तथा बल की दिशाएँ एक-दूसरे के परस्पर लम्बवत होती हैं।
महत्वपूर्ण: चुंबकीय क्षेत्र, धारा तथा बल की दिशाएँ एक-दूसरे के परस्पर लम्बवत होती हैं।
2. Fleming's Left-Hand Rule | फ्लेमिंग का बायाँ हाथ नियम
Rule: Stretch the thumb, forefinger and middle finger of your left hand mutually perpendicular to each other.
If the forefinger points in the direction of magnetic field and the middle finger points in the direction of current, then the thumb gives the direction of force or motion of the conductor.
हिन्दी: अपने बाएँ हाथ की तर्जनी, मध्यमा और अंगूठे को इस प्रकार फैलाएँ कि वे एक-दूसरे के परस्पर लम्बवत हों। यदि तर्जनी चुंबकीय क्षेत्र की दिशा और मध्यमा धारा की दिशा में हो, तो अंगूठा चालक पर लगने वाले बल या चालक की गति की दिशा बताता है।
If the forefinger points in the direction of magnetic field and the middle finger points in the direction of current, then the thumb gives the direction of force or motion of the conductor.
हिन्दी: अपने बाएँ हाथ की तर्जनी, मध्यमा और अंगूठे को इस प्रकार फैलाएँ कि वे एक-दूसरे के परस्पर लम्बवत हों। यदि तर्जनी चुंबकीय क्षेत्र की दिशा और मध्यमा धारा की दिशा में हो, तो अंगूठा चालक पर लगने वाले बल या चालक की गति की दिशा बताता है।
✋
Three Important Directions
☝ Forefinger
Magnetic Field (B)
चुंबकीय क्षेत्र की दिशा
☝ Middle Finger
Current (I)
धारा की दिशा
👍 Thumb
Force / Motion (F)
बल / गति की दिशा
3. Easy Memory Trick | याद रखने की आसान ट्रिक
F - I - B Memory Method
Forefinger → Field
तर्जनी → Magnetic Field
Middle Finger → Current
मध्यमा → Current
Thumb → Force / Motion
अंगूठा → Force / Motion
Memory Line:
“First Finger = Field, Middle = Current, Thumb = Force.”
हिन्दी ट्रिक:
“तर्जनी क्षेत्र, मध्यमा धारा, अंगूठा बल।”
4. Force on a Current-Carrying Conductor
A current-carrying conductor placed in a magnetic field experiences a force.
The direction of this force can be determined using Fleming's Left-Hand Rule.
चुंबकीय क्षेत्र में धारा-वाहक चालक पर बल:
जब किसी धारा-वाहक चालक को चुंबकीय क्षेत्र में रखा जाता है, तो उस पर बल लगता है। इस बल की दिशा फ्लेमिंग के बाएँ हाथ के नियम से ज्ञात की जा सकती है।
जब किसी धारा-वाहक चालक को चुंबकीय क्षेत्र में रखा जाता है, तो उस पर बल लगता है। इस बल की दिशा फ्लेमिंग के बाएँ हाथ के नियम से ज्ञात की जा सकती है।
F = BIL sin θ
| Symbol | Meaning | SI Unit |
|---|---|---|
| F | Magnetic force | Newton (N) |
| B | Magnetic field | Tesla (T) |
| I | Current | Ampere (A) |
| L | Length of conductor | metre (m) |
| θ | Angle between conductor/current and magnetic field | degree |
5. Special Cases of Force
F = BIL sin θ
At θ = 90°:
sin 90° = 1
F = BIL
Force is maximum.
sin 90° = 1
F = BIL
Force is maximum.
At θ = 0° or 180°:
sin θ = 0
F = 0
No magnetic force acts on the conductor.
sin θ = 0
F = 0
No magnetic force acts on the conductor.
6. What Happens When Current Direction is Reversed?
If the direction of current is reversed while the magnetic field remains unchanged, the direction of force also reverses.
हिन्दी:
यदि चुंबकीय क्षेत्र को समान रखते हुए धारा की दिशा बदल दी जाए, तो चालक पर लगने वाले बल की दिशा भी बदल जाती है।
हिन्दी:
यदि चुंबकीय क्षेत्र को समान रखते हुए धारा की दिशा बदल दी जाए, तो चालक पर लगने वाले बल की दिशा भी बदल जाती है।
Similarly, if the direction of magnetic field is reversed while current remains unchanged, the force direction reverses.
If both current and magnetic field are reversed simultaneously, the force direction remains unchanged.
If both current and magnetic field are reversed simultaneously, the force direction remains unchanged.
7. Relation Between B, I, L and Force
| Change | Effect on Force |
|---|---|
| B increases | F increases |
| I increases | F increases |
| L increases | F increases |
| θ = 90° | F is maximum |
| θ = 0° | F = 0 |
8. Vector Form
F⃗ = I (L⃗ × B⃗)
The cross product shows that the force direction is perpendicular to both the current direction and magnetic field direction.
हिन्दी:
सदिश रूप में बल की दिशा धारा की दिशा और चुंबकीय क्षेत्र की दिशा दोनों के लम्बवत होती है।
हिन्दी:
सदिश रूप में बल की दिशा धारा की दिशा और चुंबकीय क्षेत्र की दिशा दोनों के लम्बवत होती है।
9. Connection with Electric Motor
Fleming's Left-Hand Rule is directly used in understanding the working of an electric motor.
In a motor, a current-carrying coil is placed in a magnetic field. Forces act on the two sides of the coil in opposite directions, producing a turning effect or torque.
हिन्दी:
विद्युत मोटर में धारा-वाहक कुंडली को चुंबकीय क्षेत्र में रखा जाता है। कुंडली की दोनों भुजाओं पर विपरीत दिशाओं में बल लगता है, जिससे कुंडली घूमने लगती है।
In a motor, a current-carrying coil is placed in a magnetic field. Forces act on the two sides of the coil in opposite directions, producing a turning effect or torque.
हिन्दी:
विद्युत मोटर में धारा-वाहक कुंडली को चुंबकीय क्षेत्र में रखा जाता है। कुंडली की दोनों भुजाओं पर विपरीत दिशाओं में बल लगता है, जिससे कुंडली घूमने लगती है।
Motor Principle:
A current-carrying conductor placed in a magnetic field experiences a force.
मोटर का सिद्धांत:
चुंबकीय क्षेत्र में रखे धारा-वाहक चालक पर बल लगता है।
A current-carrying conductor placed in a magnetic field experiences a force.
मोटर का सिद्धांत:
चुंबकीय क्षेत्र में रखे धारा-वाहक चालक पर बल लगता है।
10. Important Difference
| Rule | Used For | Finger Direction |
|---|---|---|
| Fleming's Left-Hand Rule | Force / Motion on current-carrying conductor | Forefinger = B, Middle = I, Thumb = F |
| Fleming's Right-Hand Rule | Induced current in generator | Thumb = Motion, Forefinger = B, Middle = Current |
Exam Tip: Do not confuse Fleming's Left-Hand Rule with Fleming's Right-Hand Rule.
Left Hand → Motor → Force / Motion
Right Hand → Generator → Induced Current
Left Hand → Motor → Force / Motion
Right Hand → Generator → Induced Current
11. 30 MCQs | बहुविकल्पीय प्रश्न
1. Fleming's Left-Hand Rule is used to find:
A. Direction of magnetic field only
B. Direction of force on a current-carrying conductor
C. Resistance of conductor
D. Electric power
Answer: B
2. In Fleming's Left-Hand Rule, the forefinger represents:
A. Current
B. Force
C. Magnetic field
D. Resistance
Answer: C
3. The middle finger represents:
A. Current
B. Magnetic field
C. Force
D. Voltage
Answer: A
4. The thumb represents:
A. Current
B. Magnetic field
C. Resistance
D. Force or motion
Answer: D
5. Fleming's Left-Hand Rule is mainly associated with:
A. Electric motor
B. Electric generator
C. Transformer
D. Electric fuse
Answer: A
6. Magnetic force on a conductor is given by:
A. F = V/I
B. F = BIL sin θ
C. F = IR
D. F = Pt
Answer: B
7. Force is maximum when θ is:
A. 0°
B. 30°
C. 90°
D. 180°
Answer: C
8. Force becomes zero when conductor is parallel to magnetic field because:
A. sin 0° = 0
B. sin 90° = 1
C. B = 0
D. I = 1
Answer: A
9. SI unit of magnetic field is:
A. Newton
B. Tesla
C. Ampere
D. Volt
Answer: B
10. If current is doubled, keeping other factors constant, force becomes:
A. Half
B. Four times
C. Unchanged
D. Double
Answer: D
11. If magnetic field is doubled, force becomes:
A. Double
B. Half
C. Zero
D. One-fourth
Answer: A
12. Fleming's Left-Hand Rule involves:
A. Three mutually perpendicular directions
B. Three parallel directions
C. Two directions only
D. Four directions
Answer: A
13. If the current direction is reversed, force direction:
A. Remains unchanged
B. Reverses
C. Becomes zero always
D. Doubles
Answer: B
14. If both current and magnetic field are reversed, force direction:
A. Reverses
B. Becomes zero
C. Remains unchanged
D. Doubles
Answer: C
15. The force on a conductor is zero if the conductor is:
A. Perpendicular to field
B. Parallel to field
C. At 90°
D. Carrying maximum current
Answer: B
16. The force is maximum when conductor and field are:
A. Parallel
B. Opposite
C. Perpendicular
D. At 0°
Answer: C
17. The principle of electric motor is based on:
A. Heating effect
B. Chemical effect
C. Force on current-carrying conductor in magnetic field
D. Photoelectric effect
Answer: C
18. Which rule gives the direction of force in a motor?
A. Fleming's Left-Hand Rule
B. Fleming's Right-Hand Rule
C. Ohm's Law
D. Joule's Law
Answer: A
19. The direction of magnetic force is perpendicular to:
A. Current only
B. Magnetic field only
C. Both current and magnetic field
D. Resistance only
Answer: C
20. Which quantity does not appear directly in F = BIL sinθ?
A. Current
B. Length
C. Resistance
D. Magnetic field
Answer: C
21. The SI unit of force is:
A. Newton
B. Tesla
C. Volt
D. Watt
Answer: A
22. If L is doubled, magnetic force:
A. Becomes half
B. Doubles
C. Remains same
D. Becomes zero
Answer: B
23. Fleming's Left-Hand Rule uses the:
A. Right hand
B. Left hand
C. Both hands
D. No hand
Answer: B
24. The force depends on sinθ. At θ = 30°, sinθ is:
A. 1
B. 0
C. 1/2
D. √3/2
Answer: C
25. Which component supplies current to a rotating motor coil?
A. Brushes and commutator
B. Fuse only
C. Transformer
D. Voltmeter
Answer: A
26. A current-carrying conductor experiences force because:
A. Current creates no field
B. Magnetic field interacts with moving charges/current
C. Resistance disappears
D. Voltage becomes zero
Answer: B
27. The left-hand rule is useful in determining:
A. Motion of motor coil
B. Boiling point
C. Resistance
D. Electrical energy only
Answer: A
28. If B = 0, magnetic force on the conductor is:
A. Maximum
B. Zero
C. Double
D. Infinite
Answer: B
29. If I = 0, magnetic force is:
A. Zero
B. Maximum
C. Infinite
D. Unchanged
Answer: A
30. Fleming's Left-Hand Rule is associated with which energy conversion device?
A. Motor
B. Generator
C. Solar cell
D. Battery
Answer: A
12. 30 Subjective Questions | वर्णनात्मक प्रश्न
2 Marks
Q1. State Fleming's Left-Hand Rule.
Answer: Stretch the thumb, forefinger and middle finger of the left hand mutually perpendicular to each other. Forefinger gives magnetic field direction, middle finger gives current direction and thumb gives force/motion direction.
2 Marks
Q2. What does the thumb represent in Fleming's Left-Hand Rule?
The thumb represents the direction of force or motion of the current-carrying conductor.
2 Marks
Q3. What does the forefinger represent?
The forefinger represents the direction of the magnetic field.
2 Marks
Q4. What does the middle finger represent?
The middle finger represents the direction of conventional current.
2 Marks
Q5. Name the device based on the principle of force on a current-carrying conductor.
Electric motor.
3 Marks
Q6. Write the formula for force on a current-carrying conductor and explain the symbols.
F = BIL sinθ
F = force, B = magnetic field, I = current, L = length of conductor and θ = angle between conductor/current and magnetic field.
F = force, B = magnetic field, I = current, L = length of conductor and θ = angle between conductor/current and magnetic field.
3 Marks
Q7. Why is force maximum when a conductor is perpendicular to the magnetic field?
When θ = 90°, sin90° = 1. Therefore F = BIL, which is the maximum possible value for fixed B, I and L.
3 Marks
Q8. Why is there no magnetic force when the conductor is parallel to the magnetic field?
For a parallel conductor, θ = 0°. Since sin0° = 0, F = BIL × 0 = 0.
3 Marks
Q9. What happens to force when the current direction is reversed?
The direction of force reverses because force direction depends on current direction as given by Fleming's Left-Hand Rule.
3 Marks
Q10. What happens when both current and magnetic field are reversed?
The force direction remains unchanged because reversing both factors reverses the force direction twice.
3 Marks
Q11. Explain the role of Fleming's Left-Hand Rule in an electric motor.
The rule determines the direction of force on each side of the current-carrying coil in the magnetic field. The opposite forces produce a turning effect, causing the coil to rotate.
3 Marks
Q12. State three directions involved in Fleming's Left-Hand Rule.
1. Magnetic field direction — forefinger.
2. Current direction — middle finger.
3. Force/motion direction — thumb.
2. Current direction — middle finger.
3. Force/motion direction — thumb.
4 Marks
Q13. Explain Fleming's Left-Hand Rule with a labelled description.
The left hand is held with thumb, forefinger and middle finger mutually perpendicular. The forefinger points along magnetic field, middle finger along conventional current and thumb indicates force or motion.
4 Marks
Q14. Explain the factors affecting magnetic force on a conductor.
From F = BIL sinθ, force depends on magnetic field B, current I, length L and angle θ. Increasing B, I or L increases force. Force is maximum at 90° and zero at 0° or 180°.
4 Marks
Q15. Differentiate between Fleming's Left-Hand Rule and Right-Hand Rule.
Left-Hand Rule is used for force/motion in a motor. Right-Hand Rule is used to determine induced current in a generator.
4 Marks
Q16. Why does a current-carrying conductor experience force in a magnetic field?
The magnetic field produced by moving charges/current interacts with the external magnetic field, resulting in a magnetic force on the conductor.
4 Marks
Q17. What is the significance of the angle θ in F = BIL sinθ?
θ determines the component of magnetic field perpendicular to the conductor. At 90°, force is maximum; at 0° or 180°, force is zero.
4 Marks
Q18. A conductor carries current perpendicular to a magnetic field. What can you say about the force?
θ = 90°, therefore F = BIL. Hence force is maximum.
5 Marks
Q19. Explain the working principle of an electric motor using Fleming's Left-Hand Rule.
A current-carrying coil placed in a magnetic field experiences forces on its sides. According to Fleming's Left-Hand Rule, the forces act in opposite directions. These forces form a couple and rotate the coil. The split-ring commutator reverses current after every half rotation, maintaining rotation in the same direction.
5 Marks
Q20. Explain why the two sides of a motor coil experience forces in opposite directions.
The current in the two sides of the coil flows in opposite directions while the magnetic field remains the same. Therefore, according to Fleming's Left-Hand Rule, the forces on the two sides are opposite.
5 Marks
Q21. Derive the maximum force condition from F = BIL sinθ.
F = BIL sinθ.
The maximum value of sinθ is 1.
sinθ = 1 when θ = 90°.
Therefore:
Fmax = BIL.
The maximum value of sinθ is 1.
sinθ = 1 when θ = 90°.
Therefore:
Fmax = BIL.
5 Marks
Q22. Explain what happens if current and magnetic field are both reversed.
Reversing current reverses force direction. Reversing magnetic field again reverses force direction. Thus, when both are reversed together, the final force direction remains unchanged.
5 Marks
Q23. A conductor carries 4 A current in a 0.5 T field. Its length is 0.2 m and it is perpendicular to the field. Find force.
Given:
B = 0.5 T, I = 4 A, L = 0.2 m, θ = 90°
F = BIL sin90°
F = 0.5 × 4 × 0.2 × 1
F = 0.4 N
B = 0.5 T, I = 4 A, L = 0.2 m, θ = 90°
F = BIL sin90°
F = 0.5 × 4 × 0.2 × 1
F = 0.4 N
5 Marks
Q24. A conductor of length 0.5 m carries 3 A current in a 0.4 T magnetic field at 90°. Calculate force.
F = BIL
F = 0.4 × 3 × 0.5
F = 0.6 N
F = 0.4 × 3 × 0.5
F = 0.6 N
6 Marks
Q25. Explain the complete role of Fleming's Left-Hand Rule in an electric motor.
The motor contains a current-carrying coil placed in a magnetic field. The two sides of the coil carry current in opposite directions. Therefore they experience forces in opposite directions. Fleming's Left-Hand Rule determines these force directions. The forces produce torque and rotate the coil. The split-ring commutator reverses current after each half rotation, so the torque continues to act in the required direction. Thus the motor converts electrical energy into mechanical energy.
6 Marks
Q26. Explain the relation between magnetic field, current and force.
The magnetic force is given by F = BIL sinθ. Therefore force is directly proportional to magnetic field B, current I and conductor length L for a fixed angle. The direction is determined by Fleming's Left-Hand Rule. Maximum force occurs at 90° and zero force occurs at 0° or 180°.
6 Marks
Q27. Describe a simple experiment demonstrating force on a current-carrying conductor.
Place a straight conductor between the poles of a magnet and connect it to a battery. When current flows, the conductor experiences a force and moves. Reverse the current and the movement reverses. This demonstrates the magnetic effect of current and the direction relationship described by Fleming's Left-Hand Rule.
6 Marks
Q28. Explain why the direction of force changes when magnetic field is reversed.
Force direction depends on both current and magnetic field. When the magnetic field direction is reversed while current remains unchanged, the cross-product direction changes. Fleming's Left-Hand Rule therefore gives the opposite force direction.
6 Marks
Q29. Explain the three mutually perpendicular directions in Fleming's Left-Hand Rule.
The forefinger represents magnetic field, middle finger represents conventional current and thumb represents force or motion. These three directions are mutually perpendicular. This relationship allows the direction of any one quantity to be determined when the other two are known.
6 Marks
Q30. Explain Fleming's Left-Hand Rule and its applications.
Fleming's Left-Hand Rule determines the direction of force on a current-carrying conductor placed in a magnetic field. Forefinger represents magnetic field, middle finger represents current and thumb represents force/motion. It is especially important in understanding electric motors and other electromagnetic devices involving force on current-carrying conductors.
13. Assertion–Reason Questions
Q1.
Assertion: A current-carrying conductor experiences maximum magnetic force when placed perpendicular to the magnetic field.
Reason: sin 90° = 1.
Assertion: A current-carrying conductor experiences maximum magnetic force when placed perpendicular to the magnetic field.
Reason: sin 90° = 1.
Answer: Both Assertion and Reason are true, and Reason correctly explains Assertion.
Q2.
Assertion: A conductor parallel to a magnetic field experiences zero magnetic force.
Reason: sin 0° = 0.
Assertion: A conductor parallel to a magnetic field experiences zero magnetic force.
Reason: sin 0° = 0.
Answer: Both Assertion and Reason are true, and Reason correctly explains Assertion.
Q3.
Assertion: Fleming's Left-Hand Rule is used in an electric motor.
Reason: A current-carrying conductor experiences force in a magnetic field.
Assertion: Fleming's Left-Hand Rule is used in an electric motor.
Reason: A current-carrying conductor experiences force in a magnetic field.
Answer: Both are true, and the Reason correctly explains the application.
Q4.
Assertion: Reversing the current reverses the force direction.
Reason: Force direction depends on current direction and magnetic field direction.
Assertion: Reversing the current reverses the force direction.
Reason: Force direction depends on current direction and magnetic field direction.
Answer: Both are true, and Reason correctly explains Assertion.
14. HOTS / Competency-Based Questions
HOTS 1: A conductor experiences a force of 2 N. If current is doubled and all other factors remain constant, what will be the new force?
F ∝ I.
Therefore, doubling current doubles force.
New force = 4 N.
Therefore, doubling current doubles force.
New force = 4 N.
HOTS 2: A conductor is rotated from 30° to 90° with respect to the magnetic field. How does the force change?
At 30°:
F₁ = BIL sin30° = 0.5BIL.
At 90°:
F₂ = BIL.
Therefore, force becomes twice its value.
F₁ = BIL sin30° = 0.5BIL.
At 90°:
F₂ = BIL.
Therefore, force becomes twice its value.
HOTS 3: Why is a current-carrying conductor not deflected when it is parallel to the magnetic field?
Because θ = 0° and F = BIL sin0° = 0.
HOTS 4: If current and magnetic field are both reversed, predict the force direction.
The force direction remains unchanged because both reversals compensate for each other.
HOTS 5: A motor rotates in the wrong direction. Which two factors could be reversed to change the direction of rotation?
The direction of current or the direction of magnetic field can be reversed.
15. Golden Points for Exam | परीक्षा के महत्वपूर्ण बिंदु
✔ Fleming's Left-Hand Rule determines force/motion direction.
✔ Forefinger → Magnetic Field.
✔ Middle finger → Current.
✔ Thumb → Force/Motion.
✔ Three directions are mutually perpendicular.
✔ F = BIL sinθ.
✔ Maximum force at 90°.
✔ Zero force at 0° or 180°.
✔ Reversing current reverses force.
✔ Reversing magnetic field reverses force.
✔ Reversing both current and field leaves force direction unchanged.
✔ Fleming's Left-Hand Rule is associated with electric motor.
16. One-Minute Revision
Fleming's Left-Hand Rule:
✋ Left Hand
☝ Forefinger → Magnetic Field (B)
☝ Middle Finger → Current (I)
👍 Thumb → Force / Motion (F)
Formula:
F = BIL sinθ
Maximum:
θ = 90° → F = BIL
Zero:
θ = 0° or 180° → F = 0
Application:
Electric Motor
✋ Left Hand
☝ Forefinger → Magnetic Field (B)
☝ Middle Finger → Current (I)
👍 Thumb → Force / Motion (F)
Formula:
F = BIL sinθ
Maximum:
θ = 90° → F = BIL
Zero:
θ = 0° or 180° → F = 0
Application:
Electric Motor
17. Concept Map
| Concept | Key Point |
|---|---|
| Current-carrying conductor | Experiences force in magnetic field |
| Fleming's Left-Hand Rule | Determines force/motion direction |
| Forefinger | Magnetic field |
| Middle finger | Current |
| Thumb | Force / Motion |
| Force formula | F = BIL sinθ |
| Maximum force | θ = 90° |
| Zero force | θ = 0° or 180° |
| Main application | Electric Motor |
18. Final Summary | निष्कर्ष
English:
Fleming's Left-Hand Rule is an important rule in electromagnetism used to determine the direction of force acting on a current-carrying conductor placed in a magnetic field. The forefinger represents magnetic field, the middle finger represents current and the thumb represents force or motion. The rule forms the basis for understanding the rotation of an electric motor.
हिन्दी:
फ्लेमिंग का बायाँ हाथ नियम विद्युतचुंबकत्व का एक महत्वपूर्ण नियम है, जिसका उपयोग चुंबकीय क्षेत्र में रखे धारा-वाहक चालक पर लगने वाले बल की दिशा ज्ञात करने के लिए किया जाता है। तर्जनी चुंबकीय क्षेत्र, मध्यमा धारा और अंगूठा बल या गति की दिशा बताता है। यह नियम विद्युत मोटर की कार्यप्रणाली को समझने में महत्वपूर्ण है।
Fleming's Left-Hand Rule is an important rule in electromagnetism used to determine the direction of force acting on a current-carrying conductor placed in a magnetic field. The forefinger represents magnetic field, the middle finger represents current and the thumb represents force or motion. The rule forms the basis for understanding the rotation of an electric motor.
हिन्दी:
फ्लेमिंग का बायाँ हाथ नियम विद्युतचुंबकत्व का एक महत्वपूर्ण नियम है, जिसका उपयोग चुंबकीय क्षेत्र में रखे धारा-वाहक चालक पर लगने वाले बल की दिशा ज्ञात करने के लिए किया जाता है। तर्जनी चुंबकीय क्षेत्र, मध्यमा धारा और अंगूठा बल या गति की दिशा बताता है। यह नियम विद्युत मोटर की कार्यप्रणाली को समझने में महत्वपूर्ण है।
Magnetic Effects of Electric Current
Fleming's Left-Hand Rule
Class 10 Science | CBSE | Foundation | Competitive Preparation
