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 :
1
2
3
4
As we discussed in concept
Magnetic moment or magnetic dipole movement -
It is defined as the product of the strength of either Pole and effective length.
- wherein
In magnetic dipole
Hence n=4
Option 1)
1
This solution is incorrect
Option 2)
2
This solution is incorrect
Option 3)
3
This solution is incorrect
Option 4)
4
This solution is correct
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