Question

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's horizontal magnetic field.

Answer 1

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