Cross-sectional area of a copper wire is equal to the area of a square of length $2 \ mm$. If this copper wire draws $8 \ A$ electric current,then find the drift velocity of free electrons. The number density of electrons in the copper wire is $8 \times 10^{28} \ m^{-3}$.
- A$1.56 \times 10^{-4} \ ms^{-1}$
- B$1.56 \times 10^{-2} \ ms^{-1}$
- C$3.12 \times 10^{-3} \ ms^{-1}$
- D$3.12 \times 10^{-2} \ ms^{-1}$
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