The switch in the figure is open for a very long time and then closed at t = 0.

ID: 2237925 • Letter: T

Question

The switch in the figure is open for a very long time and then closed at t = 0. ( Use V = 3.7 V, R1 = 867 , R2 = 567 , L = 7.5 mH )

I already know some of them.

What is the current through R1 immediately after the switch is closed?

=3.7/567

What is the current through R2immediately after the switch is closed?

What is the voltage across the inductor immediately after the the switch is closed?

=3.7

After the switch has been closed for a long time what is the current through R1?

After the switch has been closed for a long time what is the current through R2?

After the switch has been closed for a long time what is the voltage across the inductor?

The switch is now opened. What is the current through R11immediately after the switch is opened?

a)when the swithch is closed,

no current will flow through R2 (since the rate of change of flux through the inductor is very high)

so current through R1=V/R

=3/800

b)Ir2=0

c)by KVL,

we get the voltage to be 3 V

d)after a long time, the inductor will allow the current to flow freely,

so the current in R1=V/R1

=3/800

e)current through R2=3/500

f)V inductor=0

e)i=3/500

i have solved it according to the figure given

please comment before rating if incorrect

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