First slide

Magnetisation and magnetic intensity

Question

A bar magnet has a coercivity 4 × 10³ Am^–1. It is desired to demagnetize it by inserting it inside a solenoid 12 cm long and having 60 turns. The current that should be sent through the solenoid is

Moderate

Solution

$\begin{array}{rcl} B & = & μ_{0} H = \frac{μ_{0} Ni}{l}; \\ i & = & \frac{H l}{N} = \frac{4 x 10^{3} x 12}{60 x 100} = 8 A \end{array}$

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