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A bar magnet suspended at a place P wher...

A bar magnet suspended at a place P where dip angle is `60^@` gives 10 oscillations per minute. The same bar magnet suspended at another place Q where dip angle is `30^@` gives 20 oscillations per minute. The ratio of magnetic fields at P and Q,`B_P/B_O`is

A

`sqrt3/4`

B

`sqrt3/2`

C

`2/sqrt3`

D

`4/sqrt3`

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