After a long time, the inductor acts as a short circuit. The potential difference across the 20Ω is zero.
The switch in the figure has been open for a long time. It is closed at t = 0 s.
(a) What is the current through the 20 ohm resistor after the switch has been closed a long time?
(b) What is the current through the 20 ohm resistor immediately after the switch is reopened?
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