An Inductance L and a Resistance R Are Connected in Series

Multiple Choice

An inductance L and a resistance R are connected in series to an ideal battery. A switch in the circuit is closed at time 0, at which time the current is zero. The energy stored in the inductor is a maximum:

A) just after the switch is closed
B) at the time t = L/R after the switch is closed
C) at the time t = L/R² after the switch is closed
D) at the time t = 2L/R after the switch is closed
E) a long time after the switch is closed