(adsbygoogle = window.adsbygoogle || []).push({}); 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/

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# Homework Help: Designing a simple magnetic field gen with a straight wire. Need current density

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