RL circuit current direction

  • Thread starter syhpui2
  • Start date
  • #1
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Homework Statement



A circuit made with a battery, a switch, an inductor. and three resistors is shown in the figure. To begin with, switch S has been open for a long time. Then at time t = 0 the switch is closed.

http://i.imgur.com/ws5UD.png
ws5UD.png


After being closed for a long time, the switch S is now opened.
What is the direction of the current in the right hand loop containing L, R2 and R3 immediately after the switch is opened?

(a) clockwise
(b) counterclockwise Correct Answer

Homework Equations



Ampere's law?

The Attempt at a Solution



I am not sure how do I ind the direction of current if switch is opened? Should be no current?

Thx
 

Answers and Replies

  • #2
gneill
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Before the switch is opened, what currents are flowing and in what directions?
 
  • #3
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Before the switch is opened, what currents are flowing and in what directions?
There are current on r2,r3 and inductor and it is clockwise...
 
  • #4
gneill
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20,913
2,862
There are current on r2,r3 and inductor and it is clockwise...
No, that's not right. Yes, there is current through the inductor, but what is that current and what is the voltage across the inductor? What about R1?
 

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