A series RL circuit with inductance L and resistance R is connected to an emf V. After a time the current reaches a final value of 5.0 A. A second series circuit connected to the same emf V is identical except that the inductance is 4L. The current in the second circuit is
A) 0.80 A.
B) 1.3 A.
C) 1.8 A.
D) 5.0 A.
E) 20 A.

Question

Quizplus · Accepted Answer

The final current in an RL circuit is determined by the resistance (R) and the applied emf (V), not by the inductance (L). Since the resistance and emf are the same in both circuits, the final current will also be the same, 5.0 A.

A Series RL Circuit with Inductance L and Resistance R