The capacitance of capacitor increases when :

(A) its charge increases
(B) its supply voltage decreases
(C) common area of the plates increases
(D) separation between the plates decreases

Choose the correct answer

(C) and (D)

The correct answer is Option (3) → (C) and (D)

Capacitance, $C=\frac{ε_0ε_rA}{D}$

where,

A = Area of overlap plates

D = Distance between the plates

(C) If common area of plate increases, A increases and thus C increases.

(D) If the seperation between the plate decreases, D decreases and thus A increases.