Question

derive the expression for the capacity of a parallel plate capacitor when the medium between the plates is partially filled by a dielectric medium​

Answer 1

As the plate 2 is earthed charge +Q being free, flows to the earth. Therefore, the capacity becomes K times the initial capacity when dielectric medium is inserted in between the plates. Two charges 2μC and –2μC are placed at points A and B, 6 cm apart. (a) Identify an equipotential surface of the system.