Inside a conducting sphere with charge Q and radius R, the electric potential is given by V = _ and outside it is given by V = _e2. Using E. = - dv R , derive an expression for the magnitude of the electric field inside and outside the sphere. (Use the following as necessary: ke, Q, r and R.) (a) inside (b) outside E(r > R) =A uniform electric field of magnitude 260 V/m is directed in the negative y direction as shown in the figure below. The coordinates of point @ are (-0.750, -0.900) m, and those of point Bare (0.300, 0.300) m. Calculate the electric potential difference V - VA using the dashed-line path. B D . E