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Question

The magnet of a vibration magnetometer is heated so as to reduce its magnetic moment by 36%. The new periodic time of the magnetometer will be

A
Increases by 25%
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B
Increases by 36%
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C
Decreases by 25%
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D
Decreases by 36%
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Solution

The correct option is B Increases by 25%
Time period, T=2πIMBH
T1M
or T1T2=M2M1
If M1=100 then, M2=(10036)=64
So, T1T2=64100=810
T2=108T1=1.25T1
So, % increase in time period =25%.

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