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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 oscillations per minute at a place where dip angle is `30^(@)` and 15 oscillations minute at a place where dip angle is `60^(@)`. The ratio of total earth's magnetic field at the two places is

A

`3sqrt(3):8`

B

`16:9sqrt(3)`

C

`4:9`

D

`2sqrt(3) :9`

Text Solution

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The correct Answer is:
B
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NTA MOCK TESTS-NTA NEET SET 47-PHYSICS
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