A resistor and an inductor are connected in series to a battery.The time constant for the circuit represents the time required for the current to reach
A)25% of the maximum current.
B)37% of the maximum current.
C)63% of the maximum current.
D)75% of the maximum current.
E)100% of the maximum current.

Question

Quizplus · Accepted Answer

The time constant for an RC or RL circuit is given by the product of the resistance and the capacitance or inductance respectively. In this case, the time constant will be given by τ = L/R. The time constant represents the time required for the current to reach 63% of the maximum current in an RL circuit. Therefore, the correct choice is C.

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