The switch in the figure has been open for a long time. it is closed at t = 0s.

The switch in the figure has been open for a long time. It is closed at t =0s.?

The switch in the figure has been open for a long time. It is closed at t =0s.

Part A

What is the current through the 20Ω resistor immediately after the switch is closed?

Part B

What is the current through the 20Ω resistor immediately after the switch is reoƿє-ṅєd?

A) 30/30=1 amp, because the inductor looks like an open circuit when the switch is first closed.

B) If the circuit has reached steady state when the switch is oƿє-ṅєd, the current thought the inductor will be 30/10=3 amps. When the switch opens, all of that current will flow through the 20 ohm resistor.

The switch in the figure has been open for a long time. it is closed at t = 0s.