In a circuit made up of inductor L,resistance R,ammeter,battery and switch in series,the current is greatest at which of the following times,as measured after the switch is closed?
A)zero
B)one time constant
C)at a time t = L/R
D)ten time constants

Question

Quizplus · Accepted Answer

The current in an LR circuit is greatest after a long time has passed since the switch was closed, reaching its maximum value asymptotically. This is because the inductor initially opposes changes in current but eventually acts like a short circuit after a long time. Ten time constants (10τ) is a conventional time used to approximate when the current has reached its maximum steady-state value, as the circuit behaves almost like there's no inductor present.

In a Circuit Made Up of Inductor L,resistance R,ammeter,battery and Switch