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 $$=1.6 \times 10^{-19} \mathrm{C}$$ ) :
- A$$\frac{6.25 \times 10^4}{\pi} \mathrm{ms}^{-1}$$
- B$$\frac{6.25}{\pi} \times 10^3 \mathrm{~ms}^{-1}$$
- C$$\frac{6.25}{\pi} \mathrm{ms}^{-1}$$
- D$$\frac{6.25 \times 10^5}{\pi} \mathrm{ms}^{-1}$$
✓ Correct answer: B
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