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Q2. A 100 capacitor is charged from 120 V d.c. supply via a 10 kΩ resistor.

(a) Calculate EACH of the following:

(i) the time taken for the capacitor voltage to reach 80 V. (6)

(ii) the energy stored in the capacitor when its voltage has reached 80 V. (3)

(b) If the supply is now removed and replaced by a second 10 kΩ resistor, calculate EACH of the following:

(i) The time taken for the capacitor to fall to 50 V. (5)

(ii) The circuit current when the capacitor voltage has fallen to 50 V. (2)