Consider the figure below. (a) Using the symmetry of the arrangement, determine the direction of the force on q in the figure above, given that qa = qb = −7.50 μC and qc = qd = +7.50 μC. (b) Calculate the magnitude of the force in newtons on the charge q, given that the square is 10.0 cm on a side and q = 5.00 μC. N