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  4. If a bar magnet of pole strength m and magnetic moment M is cut equally 4 times parallel to its axis and 3 times perpendicular to its axis then the pole strength and magnetic moment of each piece are respectively

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Q. If a bar magnet of pole strength $m$ and magnetic moment $M$ is cut equally $4$ times parallel to its axis and $3$ times perpendicular to its axis then the pole strength and magnetic moment of each piece are respectively

NTA AbhyasNTA Abhyas 2020Moving Charges and Magnetism

Solution:

Pole strength $m$ is directly proportional to cross-sectional area.
$m^{′}=\frac{m}{5} \, M^{′}=\frac{M}{5 \times 4}$