Effective Magnetic Field An electron in a hydrogen atom is in the 2p state. In a simple model of the atom, assume that the electron circles the proton in an orbit with radius, equal to the Bohr-model radius for n = 2. Assume that the speed v of the orbiting electron can be calculated by setting L = mvr, and taking L to have the quantum-mechanical value for a 2p state. In the frame of the electron, the proton orbits with radius, and speed v. Model the orbiting proton as a circular current loop, and calculate the magnetic field it produces at the location of the electron.