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two charges4q and -q are placed a distance r apart. A charge Q is placed exactly mid-way between them. what will be the value of Q so that charge 4q experiences no netforce

two charges4q and -q are placed a distance r apart. A charge Q is placed exactly mid-way between them. what will be the value of Q so that charge 4q experiences no netforce

Grade:12

1 Answers

Dibyakanti Kumar
59 Points
6 years ago
As force varies inversely as (distance between charges )^2 so the charge Q should be +q since it is at 
r/2 .
Since 4q/r^2 has to be equal to Q/(r/2)^2.

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