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Questions  

A bar magnet A of magnetic moment MA is found to oscillate at a frequency twice that of magnet B of magnetic moment MB when placed in a vibrating magnetometer. We may say that

a
MA=2 MB
b
MA=8 MB
c
MA=4 MB
d
MB=8 MA

detailed solution

Correct option is C

v=12πMBHI⇒v∝M⇒vAvB=MAMB⇒21=MAMB⇒MA=4 MB

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