Four charged particles are at the corners of a square of side. (Let A = 3, B = 4, and C = 5.) (a) Determine the electric field at the location of charge q. (Use the following as necessary: q, a, and ke.) magnitude direction ° (counterclockwise from the +x-axis) (b) Determine the total electric force exerted on q. (Use the following as necessary: q, a, and ke.) magnitude direction ° (counterclockwise from the +x-axis)