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Homework Help: Maxwell equation, magnnetic induction field question?

  1. Jul 3, 2009 #1
    1. The problem statement, all variables and given/known data
    Using "del cross B = u0J to deduce the magnetic induction field inside a long straight circular coil with 1000 turns per meter, carrying a current of 1A.

    2. Relevant equations
    Included in the question???

    3. The attempt at a solution

    I am struggling with this, it is the second (although self contained) part to another question. A tip would be enormously appretiated. Thanks
  2. jcsd
  3. Jul 4, 2009 #2
    anyone? please....
  4. Jul 4, 2009 #3


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  5. Jul 5, 2009 #4
    Hey thanks for replying. I have looked at that wiki article... and I am still too thick to work out what I have to do... Can someone please give me a more substantial hint??? Thanks
  6. Jul 5, 2009 #5


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    There are a few things you should look at. First of symmetry can you tell me by using symmetry in which direction the B-field will point? Secondly can you find a contour such that you can apply Ampere's law easily?
    Last edited: Jul 5, 2009
  7. Jul 5, 2009 #6
    I know it will be going in circles around the coil. But I cant think of any contours... I am majorly missing something here.
  8. Jul 6, 2009 #7


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    No the magnetic field will not be going in circles around the coil, how did you get to this answer?

    For clarification. We are talking about a solenoid here right?
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