Help me with solving a problem concerning RL with switch

[kavitha_rapolu]

rl with switch

In the attached figure with rl circuit and switch , at t =0- iL(0-) is 5ma , but why is the current at t =0+ ( ie when the switch is open ) iL(0+)= 0A ? Why is it violating the rule that current across the inductor can't change instantaneously ?

 

[Old Nick]

Re: rl with switch

You'll want to check out the voltage accross the inductor when you flip the switch!!

 

[kavitha_rapolu]

Re: rl with switch

isn't the voltage across the inductor 0 in both the cases (ie when the switch is first closed and then open) ?

But why is the current at t=0+ 0A ?