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A bar magnet, held horizontally, is set ...

A bar magnet, held horizontally, is set intom angular oscillations in earth's magnetic field. It has time periods `T_(1)` and `T_(2)` at two place, where the angles of dip are `delta_(1)` and `delta_(2)` respectively. Deduce an expression for the ratio of the resultant magnetic fields at the two places.

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SL ARORA-MAGNETISM-Based on (i) Earth s Magnetism (ii) magnetic field of a bar magnet
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