A short magnet produces a deflection of 37° in a deflection magnetometer in Tan-A position when placed at a separation of 10cm from the needle. Find the ratio of the magnetic moment of the magnet to the earth'* horizontal magnetic field.
Given θ = 37° d = 10cm = 0.1m
We know
[As the magnet is short]
= 0.5 × 0.75 × 1 × 10–3 × 107 = 0.375 × 104 = 3.75 ×103A-m2T–1
