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Question

If the distance between two unlike poles is doubled then the force of attraction between them becomes ........................... times its original value.

A
12
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B
14
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C
2
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D
4
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Solution

The correct option is B 14
We know that from coulomb's law of magnet-ion.
F1=μo4π.m1m2r21 F1=forceactingb/wpolesμo=permeabilityconstantm1&m2=polestrengthr1=originaldistanceofseperation.
Now, when the distance of sepration is doubled.
i.e, r2=2r1
F1=μo4π.m1m2r22
=μo4π.m1m2(2r1)2
F2=F14.
OPTION : B.


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