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Q.

A and B are two identical spherical charged bodies which repel each other with force F, kept at a finite distance apart. A third uncharged sphere of the same size is brought in contact with sphere B and removed. It is then kept at mid-point of A and B. Find the magnitude of force on C :

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a

F/2

b

Zero

c

F

d

F/8

answer is C.

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Detailed Solution

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Force between A and B, F=kq2d2

 

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Fc=k(q)q2d22-kq22d22=F

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