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.
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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