[填空题]
Compare the electric force h(7v (yoifc*+w.,am mq e1jt: ofe/bkf.yn5z*5njhwpn vd(f-( bo .zf olding the electron in orbit $(r\,=\,0.53 \times10^{-10 }\,m)$ around the proton nucleus of the hydrogen atom, with the gravitational force between the same electron and proton. What is the ratio of these two forces? $ \times10^{39 }\,C$
