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Homework Help: Square Loop

  1. Dec 1, 2009 #1
    1. The problem statement, all variables and given/known data
    A square loop of wire with a side of 10cm carries a current of 0.3A. What is the
    magnetic field in the center of the square loop?

    2. Relevant equations

    B= 2([tex]\sqrt{}[/tex]2)[tex]\mu[/tex]I/[tex]\pi[/tex]L


    3. The attempt at a solution

    Not sure if these are the right equations for this problem and if they aren't then I have no idea what to do. If they are then I just need to know what the area would be.
  2. jcsd
  3. Dec 1, 2009 #2
    Can you find a magnetic field created by 1 segment of a loop? It is similar to finding a magnetic field caused by long wire with current I.
  4. Dec 1, 2009 #3
    B= [tex]\mu[/tex]I/ 2[tex]\pi[/tex]a

    Is this right?
  5. Dec 1, 2009 #4
    sqrt(2), i think.
  6. Dec 2, 2009 #5
    so B= ([tex]\sqrt{}[/tex]2)[tex]\mu[/tex]I/2[tex]\pi[/tex]a ?
  7. Dec 2, 2009 #6
    It is just a magnitude of field due to 1 segment of a loop. Multiply it with 4. :)
  8. Dec 2, 2009 #7
    ok so that equation times 4. Thanks
  9. Dec 2, 2009 #8
    oh and I'm still not really sure what the area would be, I need it to figure out what [tex]\mu[/tex] is.
  10. Dec 2, 2009 #9
  11. Dec 2, 2009 #10
    oh yeah, I forgot about that. Thanks again.
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