Q. 18

A short magnet produces a deflection of 37° in a deflection magnetometer in Tan-A position when placed at a separation of 10 cm from the needle. Find the ratio of the magnetic moment of the magnet to the earth’s horizontal magnetic field.

Answer :

Given,


separation between the magnet and the needle, d = 10cm =0.1m


deflection in the magnetometer in the given position when placed in the magnetic field of a short magnet, θ = 37°



let M be the magnetic moment of the magnet and BH be earth's horizontal magnetic field.


according to magnetometer theory







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