Question

A potential difference of $5\, V$ is applied across a conductor of length $10 \,cm$. If drift velocity of electrons is $2.5 \times 10^{-4} \,m / s$, then electron mobility will be

• A. $5 \times 10^{-4} \,m ^{2}\, V ^{-1} \,s ^{-1}$
• B. $5 \times 10^{-6}\, m ^{2} \,V ^{-1} \,s ^{-1}$
• C. $5 \times 10^{-2} \,m ^{2}\, V ^{-1} \,s ^{-1}$
• D. Zero

Answer 1

Answer: (B)

$\mu=\frac{V_{D}}{E}$
$\mu=\frac{2.5 \times 10^{-4} \times 0.1}{5}$
$\mu=5 \times 10^{-6}\, m ^{2}\, V ^{-1} \,s ^{-1}$