Q. A current of $1\ mA$ is flowing through a copper wire. How many electrons will pass a given point in one $second$ $\lbrack e = 1.6 \times 10^{- 19}Coulomb\rbrack$
A) $6.25 \times 10^{19}$
B) $6.25 \times 10^{15}$
C) $6.25 \times 10^{31}$
D) $6.25 \times 10^{8}$
Explanation
(b) $n = \frac{1 \times 10^{- 3}}{1.6 \times 10^{- 19}} = 6.25 \times 10^{15}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.