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Question

A bar magnet used in a vibration magnetometer is heated so as to reduce its magnetic moment by 19%. The periodic time of the magnetometer will :


A
increase by 19%
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B
decrease by 19%
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C
increase by 11%
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D
decrease by 11%
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Solution

The correct option is D increase by 11%
The time period of oscillation is given by
T=2πIMB
m2=m10.19m1
m2=0.81m1

T2T1=m1m2

T2T1=10.9

ΔTT1×10011%

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