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# 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 :

$(a)\;1\qquad(b)\;2\qquad(c)\;3\qquad(d)\;4$

Can you answer this question?

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