In the solution below, at first i found out time constant then i calculated the discharged energy and in the end i derived a formula to find the amount of discharged energy for any time t .
As there is only resistor apart from capacitor whatever energy discharged must be dissipated across the resistor according to law of conservation of energy.
Power dissipated across resistor = voltage across resistor * resistance.
Solution
The below graph represents the relation between voltage vs time.Where Vs = 220V and T = 600 microseconds.After 5T we may consider capacitor is fully discharged as almost all the charge is discharged(but remember that it doesnot gets completly dicharged).
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