The drift velocity of electrons in silver wire with cross-sectional area $3.14 \times 10^{-6}\,m ^2$ carrying a current of $20\,A$ is. Given atomic weight of $Ag =108$ , density of silver $=10.5 \times 10^3\,kg / m ^3..........\times 10^{-4} m / sec$.
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(d)
Number of electrons per unit volume of silver
$n=\frac{6.023 \times 10^{26}}{108} \times 10.5 \times 10^3$
$v_d=\frac{I}{n e A}=6.798 \times 10^{-4}\,m / sec$
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