A pith-ball A of mass `9xx10^(-5)` kg carries a charge of `5 mu `C. What must be the magnitude and
Channel: Doubtnut
Date: 2021-11-02

A pith-ball A of mass `9xx10^(-5)` kg carries a charge of `5 mu `C. What must be the magnitude and sign of the charge on a pith-ball B held 2 cm directly above the pith-ball A, such that the pith-ball A remians stationary ?