Two similar spheres having `+q` and `-q` and `+4q` charges are kept at a certain distance.
Channel: Doubtnut
Date: 2020-01-19

Two similar spheres having `+q` and `-q` and `+4q` charges are kept at a certain distance. The force acts between the two is `F`. 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