A circular ring of wire of radius r0 lies in a plane perpendicular to the x-axis and is
Chapter 4, Problem 35(choose chapter or problem)
A circular ring of wire of radius r0 lies in a plane perpendicular to the x-axis and is centered at the origin. The ring has a positive electric charge spread uniformly over it. The electric field in the x-direction, E, at the point x on the axis is given by E = kx (x2 + r2 0) 3/2 for k > 0. At what point on the x-axis is the field greatest? Least?
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