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Q11. A capacitor ‘C’ is connected in series with a resistor of 2 kΩ to a 150 V d.c. supply. When the capacitor is fully charged the energy stored is 4.5 J. Determine EACH of the following:

(a) The value of the capacitor;

(b) The time taken for the capacitor to charge to half the supply voltage;

(c) The value of resistance to be added in series to increase the time found in part (b) above to 1.2 secs.