The number density of free electrons in copper is nearly 8 × 10^28 m^-3. A copper wire has its area of cross section =2 × 10^-6 m^2 and is carrying a…

The number density of free electrons in copper is nearly $\displaystyle 8 \times 10^{28} \mathrm{~m}^{-3}$. A copper wire has its area of cross section $\displaystyle =2 \times 10^{-6} \mathrm{~m}^2$ and is carrying a current of $\displaystyle 3.2$ A . The drift speed of the electrons is $\displaystyle \_\_\_\_$ $\displaystyle \times 10^{-6}$ $\displaystyle \mathrm{ms}^{-1}$