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 is 6.5 into 10 raise to power minus 7 coulomb the radius of
the radius of A and B are negligible compared to the distance of separation what is the force of repulsion if each sphere is charged double the above amount and the distance between them is
half? (NCERT)​