2: A charge of 3 nC is placed at the origin, and a charge of -1 nC is placed at a distance of 4 cm. a) Sketch the electric potential generated by each charge as well as the total potential, using dierent colours. b) Based on your sketch, where do you expect the total potential of this charge configuration to be zero? c) Now calculate the point (or points) where the total potential of this charge configuration is zero. Does the result correspond to your expectation