A 2.20 109 C charge has coordinates x = 0, y = 2.00; a 2.73 109 C charge has coordinates x = 3.00, y = 0; and a 4.80 109 C charge has coordinates x = 3.00, y = 4.00, Where all distances are in cm. Determine magnitude and direction for the electric field 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 x axis). magnitude: ? direction: ? (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). magnitude: ? direction