a. Consider an infinitely charged plate, where each two equipotential surfaces are separated by 0.5 m and have a potential difference of 3.0 V. Find the value of the surface charge density of the plate.
b. An electron and a proton, starting from rest, are accelerated through an electric potential difference of the same magnitude. In the process, the electron acquires a speed ve, while the proton acquires a speed vp. Find the ratio ve/vp.