A copper wire of radius $1 \mathrm{~mm}$ contains $10^{22}$ free electrons per cubic metre. The drift velocity for free electrons when $10 \mathrm{~A}$ current flows through the wire will be (Given, charge on electron $=1.6 \times 10^{-19} \mathrm{C}$ ) :

Question

$\frac{6.25 \times 10^4}{\pi} \mathrm{ms}^{-1}$

$\frac{6.25}{\pi} \times 10^3 \mathrm{~ms}^{-1}$

$\frac{6.25}{\pi} \mathrm{ms}^{-1}$

$\frac{6.25 \times 10^5}{\pi} \mathrm{ms}^{-1}$

Solution

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