Question

An ideal cell is connected to a capacitor through a voltmeter. The reading V of the voltmeter is plotted against time. Which of the following best represents the resulting curve?

Answer 1

Correct Answer is: (b)

This is basically an RC circuit, charging from a cell. The resistance (R) of the voltmeter is the resistance in the circuit. The voltage across R = circuit current x R = reading of the voltmeter (V). Thus, the nature of the V–t curve is the same as the nature of the I-t curve.