An electron moves from the initial position r = (0.1m)I to final position r=(0.2m)j. Along the electron's entire trajectory, it is subjected to a uniform electric field E=(15N/C)j. What is the change in the electric potential due to the electron's displacement, change V =(r final) - V(r int)? An electrostatic situation in which a 20uC point change is located at the center of a conducting spherical shell with an inner radius 4.0cm and an outer radius of 5.0cm. what is the surface charge density (i.e. charge per area) on the inner surface of the conducting sphere.