Ia. A uniform electric field of magnitude 1,000 V/m (1,000 N/C) is pointing to the right and exists everywhere. a) What is the potential difference between points x, " 0 m and x2 - 0.5 m and which point is at a higher potential? b) Calculate the change in electric potential energy if an electron moves from xi to xa. The charge on the electron is - 1.602x10-19 CAind its mass is 9.1 1x10-31 kg. (5 points)Ib. Now suppose a proton moves from point x; to point x, in problems la. a) What is the potential difference between points x; - 0 m and x; " 0.5 m and which point is at a higher potential? b) Calculate the change in electric potential energy if a proton moves from x: to x2. The charge on the proton is +1.602x10 "C and its mass is 1.67x10" kg (5 points)