1. Mar 5, 2007 #1

   Gyroscope

   

   1. The problem statement, all variables and given/known data
   Would someone, please, show me that, if there is no current inside, that:
   
   [tex]\oint \vec B \cdot d\vec l=0[/tex]
   
   Please. Thanks.
   
   
   2. Relevant equations
   
   
   
   3. The attempt at a solution

    

   Gyroscope, Mar 5, 2007
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3. Mar 5, 2007 #2

   marcusl

   

   Science Advisor

   Gold Member

   You can do this yourself! First use Stokes's theorem to relate your integral to a surface integral over curl(B), then substitute Maxwell's eqn. for curl(B). Note what happens if J and dD/dt are zero.

    

   marcusl, Mar 5, 2007
4. Mar 5, 2007 #3

   Gyroscope

   

   I do not know Stokes Theorem. :) I am preparing to IPHO.

    

   Gyroscope, Mar 5, 2007

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