Physics - Semiconductors Question with Solution | TestHub

The electron of hydrogen atom is considered to be revolving round a proton in circular orbit of radius ${\mathrm{h}}^2/{\mathrm{me}}^2$ with velocity ${\mathrm{e}}^2/\mathrm{h}$, where $\mathrm{h}=\hslash /2\pi$. The current $i$ is