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0 resistance wire in parallel circuit

  1. Aug 20, 2007 #1
    In question 1 b at the following site:

    http://ocw.mit.edu/NR/rdonlyres/Phy...48C87-C69B-44B6-AECA-CB9D875E0F40/0/exam2.pdf

    I am having trouble with 1b. At the junction right after R1, why does the current go only up and not left when the upper path has zero resistance? Is there a law that says current always travels in the path of least resistance?
     
  2. jcsd
  3. Aug 20, 2007 #2

    learningphysics

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  4. Aug 20, 2007 #3

    malawi_glenn

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    Yes current always takes the path with the smallest resistance.
     
  5. Aug 20, 2007 #4

    learningphysics

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    You can also calculate the current in R2. Since current is finite and the resistance across the inductor is 0 in part b... the voltage across the inductor is I3*0=0. Hence the voltage across R2 is 0. I2=0/R2 = 0. So the current through R2 is 0.
     
  6. Aug 20, 2007 #5
    I see. Thanks.
     
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