In a circuit made up of inductor,resistance,ammeter,battery and switch in series,at which of the following times after the switch is closed is the rate of current increase greatest?
A)zero
B)one time constant
C)reciprocal of one time constant
D)ten time constants

Question

Quizplus · Accepted Answer

At the instant the switch is closed, the current is zero and therefore the rate of change in the current is at its greatest. This is because the inductor initially resists any change in current, which causes a high rate of change in the current. As time goes by, the rate of change in the current decreases until it reaches a steady state. Therefore, choice A is the best answer.

In a Circuit Made Up of Inductor,resistance,ammeter,battery and Switch in Series,at