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Homework Help: Magnetic field ?

  1. Oct 20, 2009 #1
    magnetic field ??

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

    A single loop of wire of radius 3 cm carries a current of 2.4 A. What is the magnitude of B on the axis of the loop at the following position?
    1 cm from the center

    2. Relevant equations

    Uo/4(pi) * (2(pi)R^2 *I) / (z^2 + R^2)^(3/2)

    where Uo is 4(pi) X 10^-7

    3. The attempt at a solution

    i just pluged in values
    R = .03 m
    z = .01 m
    I = 2.4 A

    i got 4.2357797e-4 T but that is wrong??
    does anyone see something that im doing wrong?
    any help would be great!!
  2. jcsd
  3. Oct 21, 2009 #2
    Re: magnetic field ??

    for x = 0 (at center of loop)

    B = (μ0)*(I)/(2*R)

    don't know how to get b, c, or d yet though.
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