In Figure (a) below, a particle of charge +Q produces an electric field of magnitude Epart at point P, at distance R from the particle. In Figure (b), that same amount of charge is spread uniformly along a circular arc that has radius R and subtends an angle 0. The charge on the arc produces an electric field of magnitude Earc at its center of curvature P. For what value of e (in °) does Earc = 0.95Epart? (Hint: You will probably resort to a graphical solution.) \R +Qfe/2A. +Q P e/2y (a) (b) Number i Units

In Figure (a) below, a particle of charge +Q produces an electric field of magnitude Epart at point P, at distance R from the particle. In Figure (b), that same amount of charge is spread uniformly along a circular arc that has radius R and subtends an angle 0. The charge on the arc produces an electric field of magnitude Earc at its center of curvature P. For what value of e (in °) does Earc = 0.95Epart? (Hint: You will probably resort to a graphical solution.) \R +Qfe/2A. +Q P e/2y (a) (b) Number i Units