Q. A current passing through a copper voltmeter deposits 0.002 kg of copper on cathode plate in 100 min. If there are $10^{25}$ copper atoms in one kg of copper, the electric charge delivered to cathode by $C{u^{+}}^{+}$ ions per second will be
A) 0.53 C
B) 0.71 C
C) 1.06 C
D) 10.06 C
Explanation
(c) Charge delivered to cathode per second
$= \frac{0.002 \times 10^{25} \times 2 \times 1.6 \times 10^{- 19}}{100 \times 60}$
$= 1.06$ C
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.