Q 1.12(a): Two insulated charged copper spheres A and B have their centres separated by a distance of 50 cm. What is the mutual force of electrostatic repulsion if the charge on each is ? The radii of A and B are negligible compared to the distance of separation.
Since, the radii of the spheres A and B are negligible compared to the distance of separation, we consider them as point object.
Charge on each of the spheres =
and Distance between them, r = 50 cm = 0.5 m
Therefore, the mutual force of electrostatic repulsion(Since they have same sign of charge)