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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

`3sqrt3:8`

B

`16:9sqrt3`

C

`4:9`

D

`2sqrt3:9`

Text Solution

Verified by Experts

The correct Answer is:
B
`T_(1)=2pisqrt((I)/(MB_(1) cos 30))=3` and `T_(2)=2pisqrt((I)/(MB_(2) cos 60))=4`
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