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Questions  

Two magnets A and B are identical in mass, length and breadth but have different magnetic moments. In a vibration magnetometer, if the time period of B is twice the time period of A, the ratio of the magnetic moments MA/MB of the magnets will be

a
12
b
21
c
41
d
14

detailed solution

Correct option is C

T=2πIMBH⇒T∝1M⇒MAMB=TBTA2=41

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