23. An inductance L, resistance R, and ideal battery of emf ε are wired in series. A switch in the circuit is closed at time 0, at which time the current is zero. At any later time t, the emf of the inductor is given by:
(A)ε(1-e^-Lt/R)
(B)εe^-Lt/R
(C)ε(1+e^-Rt/L)
(D)εe^-Rt/L
(E)ε(1-e^-Rt/L)

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