Ahydrogen atom can be considered as having a central point-like proton of positive charge +e and an electron of negative charge -e that is treated as a volume charge distribution around the proton which is given by: p=a*e^(-2r/a) and extends out to infinity. a is a constant, a is the bohr radius, and r is the distance from the center of the atom. a) using the fact that the hydrogen atom is electrically neutral ( meaning that the electron charge distribution must integrate to a charge of -e) find a. b) then, find the electric field produced by the atom at r=a.