Numerical 1 [2075 ‘A’]

A bar magnet, 10 cm in length, has pole strength of 10 Am. Determine the magnetic field at a point on its axis at a distance of 15 cm from the centre of the magnet. ([latex]\mu_o = 4\pi\times10^{-7}Hm^{-1}[/latex]).

Solution

Given,

Length of magnet [latex](2l) = 10\ cm = 0.1\ m[/latex]

So, [latex]l = \dfrac{0.1}{2} = 0.05\ m[/latex]

Pole strength (m) = 10 Am