LR Circuits: A series circuit consists of an open switch, an ideal emf source ?0, a 5.0-k? resistor, and a 4.0-H inductor. If the potential across the resistor is 65.0 V at 2.0 ms after the switch is closed, find the source emf, ?0.
A. 71 V
B. 36 V
C. 76 V
D. 56 V
Answer: A
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