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An 8microF capacitor is connected in series with a 0.5 megaohm resistor. The DC voltage supply is 200V. Calculate the time constant.

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An 8microF capacitor is connected in series with a 0.5 megaohm resistor. The DC voltage supply is 200V. Calculate the time constant.

(a) 1s

(b) 2s

(c) 3s

(d) 4s

The question was asked during an interview for a job.

Query is from Discharge of a Capacitor Through a Resistor in chapter Capacitance and Capacitors of Basic Electrical Engineering

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The correct option is (d) 4s

For explanation: The time constant is the product of the resistance and capacitance in a series RC circuit.

Therefore, time constant = 8*10^-6*4*10^6=4s.

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