## SECTION A - Coulomb's Law and Coulomb's Law Methods
1991E1. Two equal positive charges Q are fixed on the x-axis. one at +a and the other at −a, as shown above. Point P is a point on the y -axis with coordinates (0,b). Determine each of the following in terms of the given quantities and fundamental constants.
a. The electric field E at the origin O
b. The electric potential V at the origin O .
c. The magnitude of the electric field E at point P .