Two negative charges are kept at a certain distance in the air medium. What will happen if a dielectric slab is inserted between them?
a) The slab will get heated
b) Current will flow through the slab
c) Two charges will attract each other
d) The net force between the charges will be reduced
Explanation: Force between two charges is inversely proportional to the relative permittivity of the medium between them. A dielectric slab has relative permittivity more than that of air. So the force between the charges decreases. No current or heating will be noticed.