Finfd the magnetic field at point p for the steady state configuration. Ok so the picture is a quarter circle, with inner radius a and outer radius b, and point p is at the centre as if this was a full circle. The current is running around this loop.Picture the loop at the as going along the inner surface in one direction, the outer surface in the other direction, and going from a to b and from b to a. Ok, I know how to evaluate this for the current enclosed by the loop. We just prove Ampere's Law in integral form, but I'm not sure what to do fo the magnetic field at point p, and even what it has to do with point p. So theta is 90 degrees for both sides. fo both the top and bottom peice should be Mu(o)I/4. Now the distance away for one is a and for the other is b. So one should be Mu(o)Ia/4 and the other should be Mu(o)Ib/4 Then the magnetic field should be (Mu(o)I(a+b))/4 Does this even make sense? Sorry I can't post the pic but its not that hard to picture. Mu(o) is supposed to be "mu naught".