An electron orbits a proton at a radius of 5.69 x 10^-11 m. The charge of an electron is 1.6 x 10^-19 C and its mass 9.11 x 10^-31 kg. The permeability of free space is 4pi x 10^-7 T m/A. What is he magnetic field at the proton due to the orbital motion of the electron?