Q.

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

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a

4 : 9

b

9 : 4

c

2: 3

d

3: 2

answer is A.

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Detailed Solution

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