LR Circuits: an LR Circuit Contains an Ideal 60-V Battery

question 37

Multiple Choice

LR circuits: An LR circuit contains an ideal 60-V battery, a 51-H inductor having no resistance, a 21-Ω resistor, and a switch S, all in series. Initially, the switch is open and has been open for a very long time. At time t = 0 s, the switch is suddenly closed. When the voltage across the resistor is equal to the voltage across the inductor, what is the current in the circuit?

• A) 1.4 A
• B) 0.57 A
• C) 1.1 A
• D) 0.86 A
• E) 1.7 A

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