What is the voltage across a capacitor?
The steady state voltage is determined by the resistors. The capacitor voltage is 300* 20 / (10 + 20) = 200 v In steady state the inductor acts as a short circuit and the capacitor as an open circuit. At the start when the voltage is first switched on, the inductor acts to limit the rate of increase of current and the capacitor acts as a short circuit.
