The potential difference between the ends of a straight conductor of length $20 \ cm$ is $16 \ V$. If the drift speed of the electrons is $2.4 \times 10^{-4} \ ms^{-1}$,the electron mobility in $m^2 \ V^{-1} \ s^{-1}$ is
- A$3.6 \times 10^{-6}$
- B$2.4 \times 10^{-6}$
- C$2 \times 10^{-6}$
- D$3 \times 10^{-6}$
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