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Q.

Two bar magnets are suspended and allowed to vibrate. They make 20 oscillations /minute when their similar poles are on the same side and they make 15 oscillations per minute with their opposite poles lie on the same side. The ratio of their moments

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a

9:5

b

25:7

c

16:9

d

5:4

answer is B.

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Detailed Solution

$\frac{M_{1}}{M_{2}} = \frac{n_{1}^{2} + n_{2}^{2}}{n_{1}^{2} - n_{2}^{2}}$

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