28.2 0 Fields Within the Atom. In the Bohr model of the hydrogen atom, the electron moves in a circular orbit of radius 5.3 X 1011 m with a speed of 2.2 X 106 m/s. If we are viewing the atom in such a way that the electron's orbit is in the plane of the paper with the electron moving clock- wise, nd the magnitude and direction of the electric and magnetic elds that the electron produces at the location of the nucleus (treated as a point). 28.10 . A short current element dl = (0.500 mm ) j carries a cur- rent of 5.40 A in the same direction as dl. Point P is located at r = (-0.730 m)i + (0.390 m)k. Use unit vectors to express the mag- netic field at P produced by this current element