The mid points of two small magnetic dipoles of length d in end-on positions, are separated by a distance x x d . The magnitude of force between them is proportional to x − n where n is :

Question

The mid points of two small magnetic dipoles of length d in end-on positions, are separated by a distance x x > > d . The magnitude of 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 U = − M → . B → = μ o 4 π 2 M 2 x 3 F = − d U d x = − 3 μ o 4 π 2 M 2 x 4 therefore force between them ∝ x - 4

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