Mid points of two small magnetic dipoles of length d in end-on positions, are separated by a distanc

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5.Magnetism and Matter

hard

The mid points of two small magnetic dipoles of length $d$ in end-on positions, are separated by a distance $x, (x > > d)$. The force between them is proportional to $x^{-n}$ where $n$ is

A

$1$

B

$2$

C

$3$

D

$4$

(JEE MAIN-2014)

Solution

In magnetic dipole

Force $\propto \frac{1}{r^{4}}$

In the given question,

Force $\propto x^{-n}$

Hence, $n=4$

Standard 12

Physics

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