1. The problem statement, all variables and given/known data What is the potential at point P due to a point charge Q at a distance R from P? Set V=0 at infinity. The same charge has been spread uniformly over a circular arc of radius R and central angle of 40 degrees. What is the potential at point P at the center of this arc? 2. Relevant equations F=qE E=kq/r^2 W=Fd V=W/q 3. The attempt at a solution After using the equations, I got V=(kQ)/R. I think the arc would be found in a similar way, but I don't know how to take the shape into account.