Lenz’s Law NEET Questions

Physics - Electromagnetic Induction and Alternating Currents

Lenz’s Law MCQ Questions


7.
When the north pole of a bar magnet is withdrawn from a closed coil, the face of the coil facing the magnet behaves as:
A.
No induced polarity
B.
North pole
C.
South pole
D.
Depends on magnet strength
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ANSWER :
C. South pole
8.
When the south pole of a bar magnet is pushed towards a closed coil, the direction of induced current (seen from the magnet side) is:
A.
Clockwise
B.
No current
C.
Counter-clockwise
D.
Oscillating
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ANSWER :
A. Clockwise
9.
When a bar magnet is dropped vertically through a closed horizontal metallic ring:
A.
Magnet falls with acceleration < g
B.
Magnet falls with acceleration = g
C.
Magnet falls with acceleration > g
D.
Magnet does not fall
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ANSWER :
A. Magnet falls with acceleration < g
10.
A bar magnet is dropped through a vertical copper pipe. Compared to free fall in air, the magnet:
A.
Does not fall at all
B.
Falls slower
C.
Falls at the same speed
D.
Falls faster
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ANSWER :
B. Falls slower
11.
A magnet is dropped through a plastic pipe of the same dimensions. The magnet falls:
A.
Slower than in copper pipe
B.
Faster than in copper pipe
C.
With acceleration g (as in free fall)
D.
At the same speed as in copper pipe
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ANSWER :
C. With acceleration g (as in free fall)
12.
A closed loop is placed with its plane perpendicular to a uniform magnetic field directed into the page. If the field magnitude is increasing, the induced current in the loop flows:
A.
Counter-clockwise
B.
No current flows
C.
Clockwise
D.
Depends on loop shape
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ANSWER :
A. Counter-clockwise