Two similar spheres having +q and -q ch...

Two similar spheres having `+q` and `-q` 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

Zero having no direction

8 F towards `+Q` charge

8 F towards `-Q` charge

4 F towards `+Q` charge

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