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Questions  

Two magnets of same size and mass make respectively 10 and 15 oscillations per minute at certain place. The ratio of their magnetic moments is

a
4 : 9
b
9 : 4
c
2: 3
d
3: 2

detailed solution

Correct option is A

T=2πIMBH⇒T1T2=M2M1⇒M1M2=T22T12=60/15260/102=49

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