## Two small objects each with a net charge of +Q exert a force of magnitude F on each other. We replace one of the objects with another whose

Question

Two small objects each with a net charge of +Q exert a force of magnitude F on each other. We replace one of the objects with another whose net charge is + 4Q. We move the +Q and +4Q charges to be 3 times as far apart as they were. What is the magnitude of the force on the +4Q charge ?

A. F

B. 4F

C. 4F/3

D. 4F/9

E. F/3

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1 week 2021-07-21T05:24:22+00:00 1 Answers 3 views 0

F’= 4F/9

Explanation:

Two small objects each with a net charge of +Q exert a force of magnitude F on each other. If r is the distance between them, then the force is given by :

…(1)

Now, if one of the objects with another whose net charge is + 4Q is replaced and also the distance between +Q and +4Q charges is increased 3 times as far apart as they were. New force is given by :

…..(2)

Dividing equation (1) and (2), we get :

Hence, the correct option is (d) i.e. ” 4F/9″