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 .
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 .