An Inductance L, Resistance R, and Ideal Battery of Emf

Multiple Choice

An inductance L, resistance R, and ideal battery of emf are wired in series.A switch in the circuit is closed at time t = 0, at which time the current is zero.At any later time t the emf of the inductor is given by:

A) (1 - e^-Lt/R)
B) e^-Lt/R
C) (1 + e^-Rt/L)
D) e^-Rt/L
E) (1 - e^-Rt/L)