What voltage is needed to create a current of 55 mA in a circuit containing only a 0.92 µF capacitor, when the?

When the what?

When the ? switch is closed ? It would have to be an A/C voltage

for a steady current. A D/C voltage the current would

start off being high an then go to zero when the capacitor is fully

charged.With an a/c voltage the capacitive reactants will obey

Ohms Law. V = I / Z Impedance because of a small ohmic value

due to the capacitors construction

Z = 1 / 2 pie f C C in farads say 50 Hz

Z = 1/ 2x22/7 x 50 x 0.92 /10to-6

Z = 259 ohms approx

E = I x R = 0.055 x 259

E = 14.25 volts at 50 Hz