I don't understand what is going on here. Could you please answer these question and explain their answers in great detail?
In Fig. 24-28a, what is the potential at point P due to charge Q at distance R from P? Set V = 0 at infinity. Express your answer in terms of given variables, ε0 and π.
In Fig. 24-28b, the same charge Q has been spread uniformly over a circular arc of radius R and central angle 40°. What is the potential at point P, the center of curvature of the arc? Express your answer in terms of given variables, ε0 and π.
In Fig. 24-28c, 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? Express your answer in terms of given variables, ε0 and π.
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