Charge q] = +1; is located at position (0, 0'). Charge 92 = 4q] is located at position ((3,0). Charge 43 = Sql is located at position (2d, 2d). Determine the net electric eld Em at the origin in terms of the given quantities and physical constants, including the permittivity of free space 50. Express the electric eld using ij unit vector notation. Enter precise fractions and roots rather than entering their approximate numerical values