Is the whole thing to the (3/2) or just the denominator? You have to differentiate that in terms of x. What did you get?
A circular ring of wire of radius r_0 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 the following formula where k > 0.
E=(kx)/(x^2+(r_0)^2)^(3/2)
At what point on the x-axis is the field greatest?
At what point on the x-axis is the field least?
This problem is just getting very messy and I am sure that is not right, any help is appreciated.