Question

Estimate the magnitude of current that passes through a wire, if $0.1\, mol$ of electrons flow through it in $40\, \min.$ (Assume, Avagadro's number $=6.0 \times 10^{23}$ )

• A. 4 A
• B. 9 A
• C. 12 A
• D. 14 A

Answer 1

Answer: (A)

Given, number of electrons, $n=0.1\, mol$ and time of flow, $t=40\, \min =2400\, s$
Current, $I=\frac{n Q}{t}=\frac{0.1 \times 6 \times 10^{23} \times 1.6 \times 10^{-19}}{2400}$
$\Rightarrow I=4\, A$