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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

`1.2 xx 10 ^(-6) T`

B

` 0.66 xx 10 ^(-8) T`

C

`0. 36 xx 10 ^(-6)T`

D

`0.5T`

Text Solution

Verified by Experts

`T = 2pi sqrt ((l )/(MB))therefore (T_(1))/(T _(2)) = sqrt (( B_(2))/(B _(1))), T_(1) = 1.5 and B _(1) = 0.1 xx 10 ^(-5), T_(2) = 2.5`
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