LR Circuits: As shown in the figure, a circuit consists of a resistor R = 17 ? in series with an ideal inductor L = 49 H having no resistance. At time t = 0 s, there is a 12-A current in the circuit. At that instant, what is the rate of change of the current?
A. -4.2 A/s
B. -12 A/s
C. -19 A/s
D. -27 A/s
E. -35 A/s
Answer: A
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