Question

After how many time constants, the transient part reaches more than 99 percent of its final value?

(a) 2

(b) 3

(c) 4

(d) 5

The question was posed to me during an online exam.

My doubt is from DC Response of an R-C Circuit in section Transients of Network Theory

Answer 1

Correct choice is (d) 5

To explain I would say: After five time constants, the transient part of the response reaches more than 99 percent of its final value.