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What is the voltage across the inductor at t=0?

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in Basic Electrical Engineering by (88.7k points)
What is the voltage across the inductor at t=0?

(a) 0V

(b) 20V

(c) 60V

(d) 58V

I had been asked this question in final exam.

The doubt is from Transients in LR Networks in portion Inductance in a DC Circuit of Basic Electrical Engineering

1 Answer

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Best answer
Right option is (c) 60V

Easiest explanation: Initially, when the switch is open, the current in the circuit is 0. As soon as the switch is closes at t=0+, the inductor acts as an open circuit, hence the current in the circuit is zero. Since the current in the circuit is zero, there is no voltage drop across the resistor and the voltage across the inductor is equal to the supply voltage, which is equal to 60V.

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