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Q.

The magnet suspended in uniform magnetic field is heated so as to reduce its magnetic moment by 19%. By doing this, the time period of the magnet will

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a

Increases by 11%

b

Decreases by 11%

c

Increases by 19%

d

Decreases by 4%

answer is A.

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Detailed Solution

T2T1=M1M2=10081=109T2−T1T1×100=10−99×100=11% increases 

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The magnet suspended in uniform magnetic field is heated so as to reduce its magnetic moment by 19%. By doing this, the time period of the magnet will