1. Compute the magnitude of the electric field at the center of a square with sides 22.2 cm long if the corners, taken in rotation, have charges of 1.14 ?C, 2.28 ?C, 3.42 ?C, and 4.56 ?C (all positive).
2. A positive point charge Q 1 = 3.13E-5 C is fixed at the origin of coordinates, and a negative charge Q 2 = -7.14E-6 C is fixed to the x axis at x = +1.83 m. Discover the location of the place along the x axis where the electric field due to these two charges is zero.