Answer :

For



And we know by Bohr angular momentum formula,


-------(1) where


Now, the centripetal force keeps the electron revolving around the nucleus,



Now putting the values, we get,



This is the radius of the orbit of the electron in ground state




On putting the values, we get,


Now for P.E. from to r



On putting the values, we get,


P.E.=


For modified case,


total energy at ground state =


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