A Series RL Circuit with Inductance L and Resistance R

Multiple Choice

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 6.0 A. A second series circuit connected to the same emf V is identical except that its resistance is 4R. The ratio of the rate of change of current in the first circuit to that in the second circuit is

A) 4
B) 2
C) 1
D) 0.5
E) 0.25