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Statement of a problem № 3909

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A condenser of 10 nF capacitance is charged to 3000 V and then discharged through a resistor of 10, 000 S. If the resistor has a temperature coefficient of 0.004/°C and a thermal capacity of 0.9 cal/°C, find (a) the time taken for the voltage on the condenser to fall to 1/e of its initial value; (b) the percentage error which would have been introduced if thermal effects had been ignored.

Solution:
A condenser of 10 nF capacitance is charged to 3000 V and then discharged throug

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