Electrostatics Question 185

Question: Two similar spheres having +q and q charge are kept at a certain distance. F force acts between the two. If in the middle of two spheres, another similar sphere having +q charge is kept, then it experience a force in magnitude and direction as [MP PET 1996]

Options:

A) Zero having no direction

B) 8F towards +q charge

C) 8F towards q charge

D) 4F towards +q charge

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Answer:

Correct Answer: C

Solution:

Initially, force between A and C

F=kQ2r2

When a similar sphere B having charge +Q is kept at the mid point of line joining A and C, then Net force on B is Fnet=FA+FC

=kQ2(r/2;)2+kQ2(r/2;)2=8kQ2r2=8F .



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