LR Circuits: In a series circuit containing a resistor and an inductor connected to an ideal dc source and a switch, the inductor gets 40% of its maximum current 1.8 s after the switch is closed. What is the time constant of this circuit?
A. 0.80 s
B. 1.5 s
C. 2.5 s
D. 3.5 s
E. 5.5 s
Answer: D
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