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  4. The ratio of magnetic fields on the axial line of a long magnet at distances of 10 cm and 20 cm is 12.5: 1 . The length of the magnet is

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Q. The ratio of magnetic fields on the axial line of a long magnet at distances of $10 cm$ and $20 cm$ is $12.5: 1 .$ The length of the magnet is

Magnetism and Matter

Solution:

$B_{\text {axial }}=\frac{\mu_{0}}{4 \pi} \frac{2 Md }{\left( d ^{2}-1^{2}\right)^{2}}$