The switch in the figure has been open for a long time. It is closed at t = 0 s.
Part A- What is the current through the 20 ohm resistor immediately after the switch is closed?
Part B- What is the current through the 20 ohm resistor after the switch has been closed a long time?
Part C- What is the current through the 20 ohm resistor immediately after the switch is reopened?



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