Question

When CHARGING a capacitor in a RC circuit, how does the current change with time? a) increases exponentially b) decreases exponentially c) stays constant d) decreases at a constant rate e) increases at a constant rate

Answer 1

(b) the current must decrease exponentially with time.

The maximum current will flow when there is no voltage due to the capacitor - as the charge on the capacitor increases the back-voltage increases accordingly and the current in the circuit will decrease.