A resistor and an inductor are connected in series to a battery. The battery is suddenly removed from the circuit and replaced by a wire to complete the circuit. The time constant for of the new
Circuit represents the time required for the current to decrease to
A) 63% of the original value.
B) 37% of the original value.
C) 75% of the original value.
D) 25% of the original value.
E) zero.

Question

Quizplus · Accepted Answer

The time constant for an RL (resistor-inductor) circuit is the time required for the current to decrease to 37% of its initial value after the source of EMF is removed.

A Resistor and an Inductor Are Connected in Series to a Battery