1. (a) What is the electric potential at point B in the below figure? What is the electric potential energy of an electron at point B? (NOTE: nC is a nano-Coulomb) +10nC B 4 cm 2 cm -5nc +10nC 2. Consider charges placed in the corners of a square. (a) find a combination of non-zero charges that will produce zero electric field at the center of the square but a non-zero electric potential at the center. (note: there are a lot of ways of doing this) (b) find a combination of non-zero charges that will produce zero electric potential at the center of the square but a non-zero electric field at the center. (note: there are a lot of ways of doing this) (c) find a combination of non-zero charges that will produce both zero electric potential and zero electric field at the center of the square