Induced EMF and Current NEET Questions

Physics - Electromagnetic Induction and Alternating Currents

Induced EMF and Current MCQ Questions


1.
Lenz's law is a consequence of the law of conservation of:
A.
Mass
B.
Momentum
C.
Energy
D.
Charge
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ANSWER :
C. Energy
2.
According to Lenz's law, the direction of induced current in a circuit is such that it:
A.
Is in the same direction as the inducing current
B.
Is independent of the change in flux
C.
Aids the change in magnetic flux
D.
Opposes the change in magnetic flux
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ANSWER :
D. Opposes the change in magnetic flux
3.
When the north pole of a bar magnet is pushed towards a closed coil, the induced current in the coil (as seen from the magnet side) flows:
A.
Clockwise
B.
Counter-clockwise
C.
In the same direction as in the magnet
D.
Does not flow
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ANSWER :
B. Counter-clockwise
4.
A bar magnet is moved away from a closed coil. The near face of the coil (facing the magnet) will behave as:
A.
North pole
B.
South pole
C.
Neither pole
D.
Depends on strength of magnet
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ANSWER :
B. South pole
5.
A bar magnet falls vertically through a horizontal metallic ring with its axis along the ring's axis. The acceleration of the magnet is:
A.
Greater than g
B.
Equal to g
C.
Less than g
D.
Zero
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ANSWER :
C. Less than g
6.
A copper ring is held horizontally and a bar magnet is dropped through the ring with its length along the ring's axis. The acceleration of the falling magnet will be:
A.
Zero initially, then g
B.
More than g
C.
Equal to g
D.
Less than g
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ANSWER :
D. Less than g