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A magnet makes 40 oscillations per minut...

A magnet makes `40` oscillations per minute at a place having magnetic field intensity of `0.1xx10^(-5)T`. At another place, it takes 2.5 sec to complete one vibrating. The value of earth's horizontal field at that place is

A

`0.25xx10^(-6)T`

B

`0.36xx10^(-6)T`

C

`0.66xx10^(-8)T`

D

`1.2xx10^(-6)T`

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The correct Answer is:
B
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