Question

The expression of current in R-C circuit is?

(a) i=(V/R)exp⁡(t/RC)

(b) i=(V/R)exp⁡(-t/RC)

(c) i=(V/R)-exp(⁡t/RC)

(d) i=(V/R)-exp⁡(-t/RC)

This question was addressed to me in an interview for job.

My question comes from DC Response of an R-C Circuit in portion Transients of Network Theory

Answer 1

Correct option is (b) i=(V/R)exp⁡(-t/RC)

To elaborate: The particular solution of the current equation is zero. So the expression of current in R-C circuit is  i=(V/R)exp⁡(-t/RC).