- #1
Niles
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Homework Statement
Hi all.
I'm trying to understand the H-field. From Ampére's law we have:
[tex]\oint {{\bf{H}} \cdot {\rm{d}}{\bf{l}}} = I_{free,enclosed}[/tex]
If I look at an object with zero free, enclosed current, the integral equals zero. The integral can be equal to zero even if H is not zero. But if the integral equals zero and if H is constant and parallel to dl, I can take it outside the integral, and hence H=0.
My question is: How do I know if H is in the same direction as dl and constant in magnitude?
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