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

Magnetism and Matter

Solution:

$F \propto \frac{\mu_{0}}{4 \pi} \frac{M_{1} M_{2}}{d^{4}}$
so $F \propto \frac{1}{d^{4}}$