A 1.92 x 10'9 C charge has coordinates x = 0, y = 2.00; a 3.21 X 10'9 C charge has coordinates X = 3.00, y = 0; and a 4.60 x 10'9 C charge has coordinatesx = 3.00, y = 4.00, where all distances are in cm. Determine magnitude and direction for the electric eld at the origin and the instantaneous acceleration of a proton placed at the origin. (a) Determine the magnitude and direction for the electric field at the origin (measure the angle counterclockwise from the positive Xaxis). (b) Determine the magnitude and direction for the instantaneous acceleration of a proton placed at the origin (measure the angle counterclockwise from the positive Xaxis)