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Questions  

A magnetic needle suspended by a silk thread is vibrating in the earth's magnetic field. If the temperature of the needle is increased by 500oC, then

a
The time period decreases
b
The time period remains unchanged
c
The time period increases
d
The needle stops vibrating

detailed solution

Correct option is C

T∝1M Since magnetic moment decreases with increase in temperature, hence time period T increases.

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