Two opposite and equal electric charges are placed on the x-axis, separated by a distance of 2.5 mm, to form an electric dipole. The center of the dipole is placed at the origin of the xy-axis. The magnitude of the electric field at point A (x_A= 13 cm, y_A= 0 cm) from the dipole's center is 3.5 × 10⁵ N/C. Determine the magnitude of the electric charges, in μC.