A compass needle is placed in the gap of a parallel plate capacitor. The capacitor is connected to a battery through a resistance. The compass needle:

Displacement current goes through the gap between the plates of a capacitor when the charge of the capacitor:

A capacitor of capacitance $C$ is connected across an AC source of voltage $V$, given by;
$V=V_0 \sin \omega t$
The displacement current between the plates of the capacitor would then be given by:
1. $I_d=\dfrac{V_0}{\omega C} \sin \omega t$
2. $I_d=V_0 \omega C \sin \omega t$
3. $I_d=V_0 \omega C \cos \omega t$
4. $I_d=\dfrac{V_0}{\omega C} \cos \omega t$