Q. In a copper voltameter, mass deposited in 6 minutes is $m$ gram. If the current-time graph for the voltameter is as shown here, then the E.C.E of the copper is
A) $m/5$
B) $m/300$
C) $5\ m$
D) $m/18000$
Explanation
(b) $m = Zi\ t\ $and $i\ t =$Area of given curve
$=$ Area of triangle + Area of rectangle
$\Rightarrow i\ t = \frac{1}{2} \times (2 \times 60) \times 1 + (6 - 2) \times 60 \times 1 = 300$
$\therefore Z = \frac{m}{i\ t} = \frac{m}{300}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.