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

This question was posed to me by my school teacher while I was bunking the class.

My doubt stems from DC Response of an R-L Circuit in portion Transients of Network Theory

Answer 1

Correct option is (d) 5

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