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The needle of a deflection magnetometer ...

The needle of a deflection magnetometer deflects through `45^@` from north to south when the instrument is used in Tan-A position with a magnet of length 10cm placed at a distance of 25cm. (a) Find the magnetic moment of the magnet if the earth's horizontal magnetic field is `20 muT`. (b) If the magnetometer is used in `Tan-B` position with the same magnet at the same separation from the needle, what will be the deflection?

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