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A magnet is suspended in such a way that...

A magnet is suspended in such a way that it oscillates in the horizontal plane. It makes 20 oscillation per minute at a place where dip angle is `30^(@) and 15` oscillation per minute at a place where dip angle is `60^(@)`. The ratio of earth's magnetic fields at two places is

A

`3sqrt(3):8`

B

`16:9sqrt(3)`

C

0.17291666666667

D

`2sqrt(2):3`

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