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

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The Answer of 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

A Series RL Circuit with Inductance L and Resistance R