Question

Displacement current goes through the gap between the plates of a capacitor when the charge of the capacitor
(a) increases
(b) decreases
(c) does not change
(d) is zero

Answer 1

(a) increases
(b) decreases

Displacement current inside a capacitor,
$i_{\mathrm{d}}={\epsilon }_0\frac{d{\varphi }_{\mathrm{E}}}{dt}$, where
ϕ_E is the electric flux inside the capacitor.
Up to the time the electric flux changes, there will be a displacement current. This is possible when the charge on a capacitor changes. Therefore, the displacement current goes through the gap between the plates of a capacitor when the charge of the capacitor or electric field increases or decreases inside the capacitor.