Question

If the length of a magnet is 5 cm and its pole strength is 10 a.m. what is the magnetic moment

Answer 1

0.5 A·m^2

Answer 2

The magnetic moment $m$ is given by

$$m = \text{pole strength} \times \text{length of the magnet (in meters)}$$

Here, pole strength $p = 10\, \text{A·m}$ and length $l = 5\, \text{cm} = 0.05\, \text{m}$. Thus,

$$m = 10 \times 0.05 = 0.5\, \text{A·m}^2.$$

Convert 5 cm to 0.05 m and multiply by the pole strength $10\, \text{A·m}$ to get $0.5\, \text{A·m}^2$.