$A$ potential difference of $5 \,V$ is applied across a conductor of length $10 \,cm$. If the drift velocity of electrons is $2.5 \times 10^{-4} \,m/s$,then the electron mobility will be ............ $m^2 V^{-1} s^{-1}$.
- A$5 \times 10^{-4}$
- B$5 \times 10^{-6}$
- C$5 \times 10^{-2}$
- D$0$
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