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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

`3sqrt3:8`

B

`19:9 sqrt3`

C

`4:9`

D

`2sqrt3:9`

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The correct Answer is:
B
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AAKASH INSTITUTE ENGLISH-MAGNETISM AND MATTER -ASSIGNMENT (SECTION A)
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  8. A dip needle free to move in a vertical plane perpendiculr to the magn...

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  9. If theta(1) and theta(2) be the apparent angles of dip observed in two...

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