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  4. Two small bar magnets are placed in a line with like poles facing each other at a certain distance d apart. If the length of each magnet is negligible as compared to d, the force between them will be inversely proportional to

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Q. Two small bar magnets are placed in a line with like poles facing each other at a certain distance $d$ apart. If the length of each magnet is negligible as compared to $d$, the force between them will be inversely proportional to

Magnetism and Matter

Solution:

$F=\frac{\mu_{0}}{4 \pi}\left(\frac{6 M M'}{d^{4}}\right)$ in end-on position.