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

Question

The midpoints 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, $ 3 $, $ 4 $, $ 2 $, $ 1 $

MARKS App · Accepted Answer

B = μ o 4 π 2 M x 3 , for end-on position. ∴ dF ∝ dx x 4 Therefore, force between then ∝ x - 4

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