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Q.

A compass needle is placed in the gap of a parallel plate capacitor. The capacitor is connected to a battery through a resistance. The compass needle

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a

Does not deflect

b

Deflects for a very short time and then comes back to the original position

c

Deflects and remains deflected as long as the battery is connected

d

Deflects and gradually comes to the original position in a time which is large compared to the time constant

answer is D.

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Detailed Solution

while the capacitor is charging, electric field between the plates of the capacitor is varying, as a result a magnetic field is produced which causes the deflection in compass needle and then comes back slowly.

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