1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Designing a simple magnetic field gen with a straight wire. Need current density

  1. Dec 6, 2011 #1
    1. The problem statement, all variables and given/known data
    Need to design a simple magnetic field generator of radius a= 2mm. The solid metal wire must carry a current density, jw, uniformly distributed over its cross section. The current density that must be found must have a magnetic field at a radial distance of r= 8mm from the axis of the wire is 7.5 10^-13 Tesla. Ignore end effects. Must develop the equation using Ampere's Law as the beginning derivation.


    2. Relevant equations
    I=∫J*da
    A=r*r*∏
    B∫J*ds

    3. The attempt at a solution

    I am have been trying to start off this by drawing a diagram but I don't even think it is correct.

    http://imageshack.us/photo/my-images/440/finalprep.png/
     
  2. jcsd
  3. Dec 6, 2011 #2
    Also I forgot an equation jw inside is

    J=(I)/(∏*r*r)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Designing a simple magnetic field gen with a straight wire. Need current density
Loading...