The diagram above shows part of a circuit consisting of an inductor, a resistor, and a capacitor in series.
At the instant shown the current in the circuit is 2 A, and it is decreasing at the rate of 0.2 A/s. The capacitor voltage is 5 volts, with the positive plate on the right.
The inductor has an inductance of L = 5 H, and negligible resistance.
The resistor has a resistance of R = 2 W.
What is the magnitude of the potential difference across this series combination at this instant?