The magnitude of the net electric field at a distance x from the center and on the axis of a uniformly charged ring of radius r and total charge q is given by Enet = kqx (x2 + r2)3/2. Consider two identical rings of radius 12.0 cm each, located as shown in the diagram below. The charge per unit length on each ring is +4.65 nC/cm and d = 22.0 cm. What is the magnitude of the net electric field at the center of ring B? N/C