$3\mathrm{.}3$ The particle travels from point X to point Z along the circular arc shown.Is the work done by the electric field on the particle positive, negative, or zero? Explain. $($Hint: Sketch the direction of the force on the particle and the direction of the displacement for several short intervals during the motion.$)$Compare the work done by the electric field when the particle travels from point W to point X to that done when the particle travels from point W to point Z along the path shown. Explain.