CBSE 2025 · Region 6 · Set 1 · Q27 · 3 marks
How is the necessary force provided to an electron to keep it moving in a circular orbit according to Bohr model of hydrogen atom? Derive an expression for the total energy of an electron moving in an orbit of radius $\displaystyle \mathbf{r}$ in hydrogen atom. Give the significance of negative sign in this expression.
Marking-scheme solution
The electrostatic force of attraction between the electrons and the nucleus provides the necessary centripetal force required to an electron to revolve in the orbit.
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CBSE Class 12 Physics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.