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; ∴T∝w(w = Mass of the magnet)
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