Q. Two similar bar magnets $P$ and $Q$, each of magnetic moment $M$, are taken. If $P$ is cut along its axial line and $Q$ is cut along its equatorial line, all the four pieces obtained have
Magnetism and Matter
Solution:
If pole strength, magnetic moment and length of each part are $m', M'$ and $L'$ respectively then
$\Rightarrow m'=\frac{m}{2} $
$ \Rightarrow m'=m $
$\Rightarrow L'=L$
$\Rightarrow L'=\frac{L}{2}$
$ \Rightarrow M'=\frac{M}{2}$
$ \Rightarrow M'=\frac{M}{2}$
