Two tiny charged spheres charged to +q = +3.2 nC and -q = -3.2 nC are connected using a 4.2 mm long non-conducting rod to form an electric dipole. The arrangement is placed in a uniform electric field. The angle made by the electric field and the connecting rod is 40°. If the torque on the dipole is 6.3 × 10^-9 N•m, determine the magnitude of the electric field. Treat the tiny spheres like point charges.