First slide

The bar magnet

Question

A steel wire of length I has a magnetic moment M. It is bent in l-shape as shown in fig (2). The new magnetic moment is

Moderate

A

M
B

$\frac{M}{\sqrt{2}}$
C

$\frac{M}{2}$
D

2M

Solution

We know that M = m I
$Now M^{'} = m \sqrt{[(l / 2)^{2} + (l / 2)^{2}]} = ml / \sqrt{2} or M^{'} = M / \sqrt{2}$

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