Which condition is necessary for a capacitor to charge properly?

For a capacitor to charge properly, it is essential to have a complete circuit. This is because a capacitor stores electrical energy in an electric field created by a voltage difference across its terminals. When a voltage is applied in a closed circuit, the current flows through the circuit, allowing the capacitor to charge up to the applied voltage.

In an incomplete circuit, there would be no path for the current to flow, and therefore, the capacitor would not receive the electrical energy needed to charge. Consequently, a complete circuit is fundamental for enabling the current to flow from the power source to the capacitor, facilitating the charging process. This ensures that the capacitor can accumulate the electrical charge necessary for its intended function in a circuit.