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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 ifHis not zero. But if the integral equals zero and ifHis constant and parallel to dl, I can take it outside the integral, and henceH=0.

My question is: How do I know ifHis in the same direction as dland constant in magnitude?

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# Homework Help: H-field and Ampére's law

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