I don't know what you mean by "Kx.ax". And what is a "one dimensional field"? Do you mean, for example, v(x, y, z)= <a, b, c>x, so that, for all x, y z, the vectors are in the same direction? Or is this a one dimensional problem so that vectors only exist along a single line?

Stoke's theorem says that that the integra around the boundary of a region, of "[LaTeX ERROR: Convert failed] " is equal to the integral of over the region itself. Have you calculated those integrals?

(Did you eventrythis one? It turns out to be pretty close to trivial!)

If you honestly have no idea how to even start these problems you need to talk to your professor about it. The last thing you want to do is make your professor think you know something you don't!