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Question

A magnet is suspended horizontally in the earth’s magnetic field. When slightly displaced, it oscillates in the horizontal plane with a period T. If a piece of wood having the same moment of inertia as the magnet is attached to the magnet, the new period of oscillation is


A

T2

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B

T2

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C

2T

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D

2T

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Solution

The correct option is C

2T


T=2πImBH; T=2π2ImBH=2T


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