A circular loop of wire, with radius R, lies in the xy plane (centered at the origin) and carries a current I running counterclockwise as viewed from the positive z axis.
(a) What is its magnetic dipole moment?
(b) What is the (approximate) magnetic field at points far from the origin?
(c) Show that, for points on the z axis, your answer is consistent with the exact field (Ex. 5.6), when z≫R.