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Q.

The time period of oscillation of a magnet in vibration magnetometer is 1.5 second. The time period of oscillation of another magnet similar in size, shape and mass but having one-fourth magnetic moment than that of the first magnet oscillating at the same place will be

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a

0.75 sec

b

1.5 sec

c

3.0 sec

d

6.0 sec

answer is C.

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Detailed Solution

T=2πIMBH T=2πI(M/4)BH=22πIMBH= 2 x 1.5 = 3sec.
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