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What will be the diameter of your coil?

  1. Apr 1, 2009 #1
    1. The problem statement, all variables and given/known data

    You have a 1.10-m-long copper wire. You want to make an N-turn current loop that generates a 0.800 mT magnetic field at the center when the current is 1.50 A. You must use the entire wire.

    What will be the diameter of your coil?


    2. Relevant equations

    B = (mu_0)(n)(i)/(2r)

    2(pi)(r)(n) = 1.1 ?

    3. The attempt at a solution

    0.8 * 10^-3 = 4(pi)*(10^-7)n(1.5)/2r

    find n/r from this then:

    nr = 1.1/2(pi)

    combine the two you get r^2 = ...

    I'm not sure if im going right here although I'm quite positive.. Need help on the calculations.
     
  2. jcsd
  3. Apr 1, 2009 #2
    ok.. if the question was this: You have a 1.0-m-long copper wire. You want to make an N-turn current loop that generates a 1.0 mT magnetic field at the center when the current is 1.0 A. You must use the entire wire.

    the answer would be:

    http://img10.imageshack.us/img10/8501/picture3vwq.png [Broken]

    now please help me find the answer that corresponds to my values.
     
    Last edited by a moderator: May 4, 2017
  4. Apr 1, 2009 #3
    anyone?
     
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