$A$ current of $2 \,A$ is passing through a metal wire of cross-sectional area $2 \times 10^{-6} \,m^{2}$. If the number density of free electrons in the wire is $5 \times 10^{26} \,m^{-3}$, the drift speed of electrons is (Given, $e = 1.6 \times 10^{-19} \,C$)
- A$\frac{1}{32} \,ms^{-1}$
- B$\frac{1}{16} \,ms^{-1}$
- C$\frac{1}{40} \,ms^{-1}$
- D$\frac{1}{80} \,ms^{-1}$
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