Q.

The time period of a bar magnet suspended horizontally in the earth's magnetic field and allowed to oscillate

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a

Is directly proportional to the square root of its mass

b

Is directly proportional to its pole strength

c

Is inversely proportional to its magneric moment

d

Decreases if the length increases but pole strength remains same

answer is A.

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Detailed Solution

T=2πIMBH and I=wl2+b212;   Tw

(w = Mass of the magnet)

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The time period of a bar magnet suspended horizontally in the earth's magnetic field and allowed to oscillate