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  4. A thin bar magnet of length 2 ℓ and breadth 2 b pole strength m and magnetic moment M is divided into four equal parts with length and breadth of each part being half of original magnet. Then the pole strength of each part is

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Q. A thin bar magnet of length $2 \ell$ and breadth $2 \,b$ pole strength $m$ and magnetic moment $M$ is divided into four equal parts with length and breadth of each part being half of original magnet. Then the pole strength of each part is

Magnetism and Matter

Solution:

As breadth of each part is half the original breadth, therefore, pole strength becomes half (i.e. $m/2$).