a bar magnet is placed horizontally in magnetic meridian. at a large distance from the magnet, the frequency of oscillation of a small magnetic needle is found to be n1. not bar magnet is reversed in direction and frequency of oscillation of rhe needle is found to be n2(>n1). the frequency of the needle, if bar magnet is completely removed from this place and magnetic needle is allowed to oscillate only in earth's magnetic field, is
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sorry I don't known physics
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