If work done by electrostatic force on a system of point charges is positive, then potential energy of system will a) increase b) decrease c) remain constant d) may increase or decrease Share with your friends Share 0 Sanjay Singh answered this Dear student work done by electrostatic force or any conservative force is equal to negative of change in potential energy.Wby electrostatic force=-(Uf-Ui)if Wby electrostatic force is positive than+ve=-(Uf-Ui)(Uf-Ui)=-vemeans Uf<Ui orthe potential energy of the system decreasesRegards 2 View Full Answer