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 2.0 A. A second series circuit is identical except that the inductance is 2L. When the second circuit is connected to the same emf V, the final value of the current will be
A) 1.0 A
B) 2.0 A.
C) 4.0 A.
D) 8.0 A.

Question

Quizplus · Accepted Answer

The final current in an RL circuit is given by V/R. Since the emf and resistance are the same in both circuits, the final current will be the same. Therefore, the final current in the second circuit will be 2.0 A.

A Series RL Circuit with Inductance L and Resistance R