Consider a flat, circular current loop of radius $R$ carrying a current $I$ . Choose the $x$ axis to be along the axis of the loop, with the origin at the loop's center. Plot a graph of the ratio of the magnitude of the magnetic field at coordinate $x$ to that at the origin for $x=0$ to $x=5 R$ . It may be helpful to use a programmable calculator or a computer to solve this problem.