An LR circuit is prepared for an experiment, initially with its switch open. The time constant is that time after switch closure at which the current reaches approximately what percentage of its final value?
A) 100%
B) 90%
C) 37%
D) 63%
E) 50%

Question

Quizplus · Accepted Answer

The time constant of an LR circuit, given by the formula tau = L/R, is the time it takes for the current to reach 63% of its final value. Therefore, the answer is D.

An LR Circuit Is Prepared for an Experiment, Initially with Its