In the circuit shown, the switch has been in position a for a long time. At t =
ID: 2084627 • Letter: I
Question
In the circuit shown, the switch has been in position a for a long time. At t = 0, the switch changes from position a to b. Look carefully at the circuit topology after the switch changes state. We now have an independent current source pushing current through a previously de-energized inductor. The current through the inductor cannot be greater than zero immediately after the switch. But the current source is independent, so it cannot be made zero. Which one dominates? Here we observe the limits of our idealizations. In reality something will happen to balance things out. What "reality" option do you think makes the most sense? Options:
The inductor will instead behave as a normal wire until the current becomes steady.
The resistor will "absorb" the temporary excess current until the inductor can catch up.
The voltage across the inductor will spike tremendously until some component is shorted out or burned up - thus stopping current.
The current source will try to maintain current but saturate, thus keeping voltage at steady state levels and preventing current flow to the inductor.
The inductor will instead behave as a normal wire until the current becomes steady.
The resistor will "absorb" the temporary excess current until the inductor can catch up.
The voltage across the inductor will spike tremendously until some component is shorted out or burned up - thus stopping current.
The current source will try to maintain current but saturate, thus keeping voltage at steady state levels and preventing current flow to the inductor.
1 nH 1 HA 100Explanation / Answer
When switch is closed the inductor will behave like a open circuit with parallel to Current source. So here, Inductior behave like an wire until the current becomes study. Also as time progress inductor can catch up the current till then resistor will absord the excess current.
Also, Current source will try to maintain current in the circuit as the source is independent source. So it will prevent the current flow to the inductor as well. Also it will keep the voltage at steady state levels also.
A,B, D options are correct.