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
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B
2
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C
3
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D
4
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Solution
The correct option is D4 Magnetic field due to dipole, B∝1x3 The interaction energy of two dipole is U=−m⋅B,U∝x−3