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A short magnet makes 40 oscillations per...

A short magnet makes 40 oscillations per minute when used in an oscillation magnetometer at a place where the earth's horizontal magnetic field is `25 muT`. Another short magnet of magnetic moment `1.6 A m^2` is placed 20 cm east of the oscillating magnet. Find the new fregquency of oscillation if the magnet has its north pole (a) towards north and (b) towards south.

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