Question

How can capacitance be increased?

Answer 1

By introducing a dielectric slab in between the plates.

Explanation:

Capacitance of a parellel plate capacitor is given by

`"C" = (ε_0"A")/"d"`

On introduction of a dielectric slab of dielectric constant `K` in an isolated charged capacitor

`"C’" = (Kepsilon_0"A")/"d"`

`"C’" = K"C"`

Capacitance becomes `K` times of original capacitor.