Question

A single electron has change $\left|e\right|=1.6\times {10}^{-19}C$. If the current passing through a conducting wire is $0.32A$, how many electrons would pass through the wire In one hour?

• A. $7.2\times {10}^{20}$
• B. $7.2\times {10}^{21}$
• C. $7.2\times {10}^{19}$
• D. $2\times {10}^{18}$

Answer 1

Answer: (B)

$7.2\times {10}^{21}$

Charge on electron, $\left|e\right|=1.6\times {10}^{-19}C$
Current through wire $=0.32A=0.32C/s$
$=\frac{0.32}{1.6\times {10}^{-19}}e/s=2\times {10}^{18}e/s$
No. of '$e$' pass through wire in one hour
$=2\times {10}^{18}\times 3600e/hr$
$=7.2\times {10}^{21}e/hr=72\times {10}^{20}e/hr$