F c = m e v 2 R = G m e m p R 2 = F g . F_c = \frac{m_e v^2}{R} = G \frac{m_e m_p}{R^2} = F_g. Fc​=Rme​v2​=GR2me​mp​​=Fg​. L = m e R G m p R = m e G R m p . [1]: M 2 = 2 α ′ ( N + N ~ − 2 ) = String Theory.