A switch, a 220Ω  resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?

1. 

A switch, a 220  resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?
[A]. 91 mA
[B]. 78 mA
[C]. 57 mA
[D]. 400 mA

Answer: Option B

Explanation:

No answer description available for this question.
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