A constant electric current $I$ is passed through a straight conductor of length $l$. If $S$ in specific charge of electron then the total momentum of electrons is
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Total momentum of electrons $=$ total no. electron
$\times$ momentum of each electron
$=\mathrm{Nmv}_{\mathrm{d}}=\mathrm{nA} \ell \mathrm{mv}_{\mathrm{d}}$
$=\frac{\mathrm{I} \ell}{\mathrm{e}} \mathrm{m}=\frac{\mathrm{I} \ell}{\mathrm{S}}$
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