Eddy currents can be minimised by:
1. reducing relative motion between the core and magnet in an electric motor
2. by making the core of thin laminations
3. by increasing the conductor cross-sectional area
4. both (1) and (2) are correct
Subtopic:  Eddy Current |
 79%
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
 
Assertion (A): A bar magnet is dropped into a long vertical copper tube. Even taking air resistance as negligible, the magnet attains a constant terminal velocity. If the tube is heated, the terminal velocity gets increased.
Reason (R): The terminal velocity does not depend on eddy current produced in copper tube.

In the light of the above statements choose the correct answer from the options given below:
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Eddy Current |
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The variation of induced emf (E) with time (t) in a coil if a short bar magnet is moved along its axis with a constant velocity is best represented as:
    

1. 2.  
3. 4.
Subtopic:  Faraday's Law & Lenz Law |
 66%
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A conducting rod is rotated in a plane perpendicular to a uniform magnetic field with constant angular velocity. The correct graph between the induced emf \((e)\) across the rod and time \((t)\) is:

1. 2.
3. 4.
Subtopic:  Motional emf |
 54%
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The slotting processes in a metallic sheet results in:

1. The increase of the resistance in the path for circulation of current.
2. Decrease in the strength of eddy current.
3. A feeble in the electromagnetic damping.
4. All of these
Subtopic:  Eddy Current |
 82%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):

Assertion (A): Self-inductance is called the inertia of electricity.
Reason (R): It is on account of self-inductance that the coil opposes any change in current passing through it. 
In the light of the above statements choose the correct answer from the options given below:
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.
Subtopic:  Self - Inductance |
 86%
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Given below are two statements: 

Assertion (A): When a piece of non-metal and a metal are dropped from the same height near the surface of the earth, the non-metallic piece will reach the ground first.
Reason (R): Induced current in metal will decrease the acceleration.
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.
Subtopic:  Motional emf |
 84%
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
 
Assertion (A): Iron loss is minimized by using a laminated core.
Reason (R): Lamination of core restricts eddy current.

In the light of the above statements choose the correct answer from the options given below:
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Eddy Current |
 90%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
 
Assertion (A):  The induced electric field is non-conservative.
Reason (R): Work done in a closed path in the induced electric field is non-zero.

In the light of the above statements choose the correct answer from the options given below:
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

Subtopic:  Motional emf |
 71%
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
 
Assertion (A): Lenz's law is in accordance with the conservation of energy.
Reason (R): The amount of mechanical energy lost against the induced emf or current is equal to the electrical energy reappearing in the circuit.


In the light of the above statements choose the correct answer from the options given below:
 

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Faraday's Law & Lenz Law |
 89%
From NCERT
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