Question

Current of 1mA is flowing through a copper wire. How many electrons will pass a given point in one second.

• A. $6.25\times {10}^{19}$
• B. $6.25\times {10}^{15}$
• C. $6.25\times {10}^{31}$
• D. $6.25\times {10}^8$

Answer 1

Answer: (B)

$6.25\times {10}^{15}$

Given : $I=0.001$ A $t=1$ s

Number of electrons passing $n=\frac{It}{q}=\frac{0.001\times 1}{1.6\times {10}^{-19}}=6.25\times {10}^{15}$ electrons