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 :

  • Option 1)

    1

  • Option 2)

    2

  • Option 3)

    3

  • Option 4)

    4

 

Answers (1)

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

Fig 5

 

 m \widetilde{=}10^{23} Am^{23}

In magnetic dipole

F\propto \frac{1}{r^{4}} In\, \, \, given\, \, \, question\, \, \, F\propto \, \, \,x^{-n}

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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