Question

When will capacitor fully charged?

(a) When the voltage across its plates is half the voltage from ground to one of its plates

(b) When the current through the capacitor is a 1/root2 time its value

(c) When the supply voltage is equal to the capacitor voltage

(d) Never

I got this question during an interview for a job.

My question is taken from Charge and Voltage topic in chapter Capacitance and Capacitors of Basic Electrical Engineering

Answer 1

Correct option is (c) When the supply voltage is equal to the capacitor voltage

The explanation: When the capacitor voltage is equal to the supply voltage the current stops flowing through the circuit and the charging phase is over.