A magnetic needle is kept in a uniform m...

A magnetic needle is kept in a uniform magnetic field of induction `0.5xx10^(-4)` tesla. It makes `30` oscillaitons per minute. If it is kept in a field of induction `2xx10^(-4)` tesla. Then its frequency is

1 oscillation/s

60 oscillations/s

15 oscillations/min

15 oscillations/s

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The correct Answer is:

`nalphasqrtB`

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