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Q.

Two magnets are placed one above the other with like poles together the time period of this combination is 10seconds. Now they are placed one above the other with unlike poles together the time period of this combination in the same field is 20sec. The ratio of magnetic moments is

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a

3:1

b

5:1

c

5:3

d

3:5

answer is C.

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Detailed Solution

M1M2=T12+T22T22T12=102+202202102=53

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Two magnets are placed one above the other with like poles together the time period of this combination is 10seconds. Now they are placed one above the other with unlike poles together the time period of this combination in the same field is 20sec. The ratio of magnetic moments is