The figure shows an uneven arrangement of electrons (e) and protons (p) on a circular arc of radius r = 2.05 cm, with angles θ1 = 32.0∘, θ2 = 53.0∘, θ3 = 30.0∘, and θ4 = 31.0∘. What are the (a) magnitude and (b) direction (relative to the positive direction of the x axis) of the net electric field produced at the center of the arc? (a) Number Unit (b) Number Unit