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T(0) is time period of oscillation of th...

`T_(0)` is time period of oscillation of the needle in uniform horizontal magnetic field `(B_(H))` of earth. If another magnetic field is applied perpendicular to `B_(H)` such that the needle deflects by `theta` for its equilibrium. Now period of oscillation of needle is T .The relation between `T` and `T_(0)` is

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