First slide

Magnetisation and magnetic intensity

Question

A bar magnet of magnetic moment 10 Am² has a cross sectional area of 2.5 × 10^–4 m². If the intensity of magnetization of the magnet is 10⁶ A/m, then the length of magnet is

Moderate

Solution

$\begin{array}{rcl} I & = & \frac{M}{l A}; \\ l & = & \frac{10}{10^{6} x 2.5 x 10^{- 4}} = 0.04 m \end{array}$

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