A charge +Q is uniformly distributed over a quarter circle of radius R, as shown above. Points A, B, and C are located as shown, with A and C located symmetrically relative to the xaxis. Express all algebraic answers in terms of the given quantities and fundamental constants. 
 (a) Rank the magnitude of the electric potential at points A, B, and C from greatest to least, with number 1 being greatest. If two points have the same potential, give them the same ranking.
Justify your rankings.


Point P is at the origin, as shown below, and is the center of curvature of the charge distribution.
