$A$ current of $10 \,A$ is maintained in a conductor of cross-section $1 \,cm^2$. If the number density of free electrons is $9 \times 10^{28} \,m^{-3}$,the drift velocity of free electrons is .......... $m/s$.
- A$6.94 \times 10^{-6}$
- B$5.94 \times 10^{-2}$
- C$1.94 \times 10^{-3}$
- D$2.94 \times 10^{-4}$
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