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Q.

The time period of a vibration magnetometer is T0. Its magnet is replaced by another magnet whose moment of inertia is 3 times and magnetic moment is 1/3 of the initial magnet. The time period now will

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a

3T0

b

T0

c

T03

d

T03

answer is A.

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Detailed Solution

T=2πIMBH; I→3 times and M→13timesT'=2π3IM3BHT'=3T0
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