Question

What happens when the capacitor is fully charged?

Answer 1

1. No current flows in the circuit when the capacitor is fully charged.
2. As the potential difference across the capacitor is equal to the voltage source.
3. For a capacitor charge
   $$\begin{gathered} \text{chanrge=capacitance×}\mathrm{potential}\mathrm{difference} \\ Q=CV \end{gathered}$$
4. The voltage is rising linearly with time, the capacitor will take a constant current.
5. The voltage stops changing, the current is zero.
6. The charging current drops to zero, such that capacitor voltage = source voltage.

Hence, no current flows in the circuit when the capacitor is fully charged.