Hello, this is not a homework assignment. I am referencing an old assignment from a few semesters ago. I am curious if I can use the basic: dB = mu/4pi dq * v X r /r^2; where dq = sigma*da=sigma*L*dx; instead of just using Amp's Law. this stuff was fun...dunno if i was at all correct. things the problem has to give me for my method to have the same numerical value, if method is equivalent is: the z distance, length of area, a distance in the x direction, velocity, and sigma.