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An electric charge q exerts a force F on similar electric charge q separated by a distance 'r' . A third charge -q/4 is placed midway between the two charge . Now force acting on charge q due to other two charges becomes .
answer is distance of charges is 4.F=kq/r2-kq/[4-r2]0=[4-r2]-r2=0=4-2r2=2=r2=[4-2]2=[2]2=4hense the answer is 4
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