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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

`0.09 xx 10^-6T`

B

`0.18 xx 10^-6T`

C

`0.36 xx 10^-6T`

D

`0.72 xx 10^-6 T`

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