Question

two carges are placed ata a distance of 10 cm with magitude of 0.2microC and 0.01microC calculate the work done to reducinf the distance to 5cm

Answer 1

Work done = Change in potential energy (Uf - Ui)

Ui = (0.2 microC) (0.01 microC) / (4 x Pi x Epsilon x 0.1)

Uf = (0.2 microC) (0.01 microC) / (4 x Pi x Epsilon x 0.05)

Work done = Uf - Ui

                  = 0.00018 Joules