| 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: [JEE ONLINE 09-04-2014] |
 |
A) 1
B) 2
C) 3
D) 4
Correct Answer: D
Solution :
| [d] In magnetic dipole |
| Force \[\propto \frac{1}{{{r}^{4}}}\] |
| In the given question, |
| Force \[\propto {{x}^{-n}}\] |
| Hence, n = 4 |
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