The electric potential between a proton and an electron is given by V = V0 In \(\left( \frac { r }{ { r }_{ 0 } } \right) \),where r0 is a constant. Assume that Bohr atom model is applicable to potential, then variation of radius of nth orbit rn with the principal quantum number n is
\({ r }_{ n }\propto \frac { 1 }{ n } \)
\({ r }_{ n }\propto{ n } \)
\({ r }_{ n }\propto \frac { 1 }{ n^2 } \)
\({ r }_{ n }\propto{ n^2 } \)
