Do you mean ?

Parametric equations for the circle are , , z= 0 so that (Yes, but that doesn't make sense here. I presume you meant .)The curve C is the circumference to the circle: R = a, z = 0, 0 <= pi <= 2 pi.

Take the dot product of and and integrate with respect ot from 0 to .[/quote]Calculate the line integral over the closed integral C of H*dl

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Anyone that can give me some hints of the methodology to use? I have tried to solve it, but I do not succeed.

Thanks!

Anders Branderud

bloganders.blogspot.com[/QUOTE]