Q.

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

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a

12

b

21

c

41

d

14

answer is C.

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Detailed Solution

T=2πIMBH⇒T∝1M⇒MAMB=TBTA2=41
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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