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Q.

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

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a

MA=2 MB

b

MA=8 MB

c

MA=4 MB

d

MB=8 MA

answer is C.

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Detailed Solution

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