In Fig. 24-27 a, what is the potential at point P due to charge Q at distance R from P ? Set V = 0...

(a) In Fig. 24-27 a, what is the potential at point P due to charge Q at distance R from P? Set V = 0 at infinity. (b) In Fig. 24-27b, the same charge Q has been spread uniformly over a circular arc of radius R and central angle 40째. What is the potential at point P, the center of curvature of the arc? (c) In Fig.24- 27c, the same charge Q has been spread uniformly over a circle of radius R. What is the potential at point P, the center of the circle? (d) Rank the three situations according to the magnitude of the electric field that is set up at P, greatest first.