1. Mar 23, 2008 #1

   jalen

   

   1. The problem statement, all variables and given/known data
   
   12.5A, 3.1x10^-5
   
   2. Relevant equations
   
   How far from a long conductor passing a current of 12.5A is the magentic field of strength 3.1x10^-5T?
   
   3. The attempt at a solution
   
   B= uI/2(pi)r
   
   r=uI/2(pi)B
   =(4pi)(12.5A)/ 2(pi)(3.1x10^-5T)
   = 8.1x10^5m

    

   jalen, Mar 23, 2008
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3. Mar 23, 2008 #2

   Snazzy

   

   u_0 isn't 4 pi.

    

   Snazzy, Mar 23, 2008

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