- #1

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- 10

- Homework Statement
- Switch is closed when t < 0, switch in the circuit shown has been closed for a

long time and conditions have settled. Switch at the moment t=0 is opened . Calculate the moment of time when the current in R1 is equal to 9.2 mA.

- Relevant Equations
- .

Hi guys , I've been trying to think this one out but I'm drawing a blank.

What I am able to understand that I'm required to calculate the backwards emf when the switch is opened. The current through the resistor R1 is 9mA. I was wondering if 9.2mA is even possible? Can the current exceed Imax at the moment of discarge? I know a lot of current is generated to discharge the magnetic field energy stored in the inductor. As I see the normal current path through the inductor is a - b , and at the moment of discharge it should be b-a and then though the R1 to the switch because it's the shortest path. Is there a possible way to calculate what kind of voltage is going though the resistor when inductor is releasing the energy? Maybe that's the way to calculate Imax in the R1.

What I am able to understand that I'm required to calculate the backwards emf when the switch is opened. The current through the resistor R1 is 9mA. I was wondering if 9.2mA is even possible? Can the current exceed Imax at the moment of discarge? I know a lot of current is generated to discharge the magnetic field energy stored in the inductor. As I see the normal current path through the inductor is a - b , and at the moment of discharge it should be b-a and then though the R1 to the switch because it's the shortest path. Is there a possible way to calculate what kind of voltage is going though the resistor when inductor is releasing the energy? Maybe that's the way to calculate Imax in the R1.