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Two different magnets are tied together and allowed to vibrate in a horizontal plane. When their like poles are joined, time period of oscillation is 5 s and with unlike poles joined. Time period of oscillation is 15 s. The ratio of their magnetic moments is

A

`5:4`

B

`1:3`

C

`3:1`

D

`2:5`

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The correct Answer is:
A
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