A resistor with r 40 kohm is placed in series with a 240 v, Ask an Expert

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A resistor with R = 4.0 kohm is placed in series with a 240 V battery, an open switch, and an inductor having L = 36.0 mH. At some time after the switch has been closed, the current in the circuit is 15.0 mA. At this same instant in time, what is the voltage across the inductor?

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