Question

Two metal plates having charges Q, −Q face each other at some separation and are dipped into an oil tank. If the oil is pumped out, the electric field between the plates will

Options

• increase

• decrease

• remain the same

• become zero

Answer 1

increase

Oil between the plates of the capacitor acts as a dielectric. We know that the electric field decreases by a factor of `1/K` of the original field when we insert a dielectric between the plates of a capacitor (K is the dielectric constant of the dielectric). So, if the oil is pumped out, the electric field between the plates will increase, as the dielectric has been removed.