Q. In an electroplating experiment, $m\ gm$ of silver is deposited when $4\ ampere$ of current flows for $2\ minute.$ The amount (in $gm$) of silver deposited by $6\ ampere$ of current for $40\ second$ will be

A) $4\ m$
B) $m/2$
C) $m/4$
D) $2\ m$
Explanation

(b) By Faraday’s law, $m \propto it$
$\therefore\frac{m_{1}}{m_{2}} = \frac{i_{1}t_{1}}{i_{2}t_{2}} \Rightarrow \frac{m}{m_{2}} = \frac{4 \times 120}{6 \times 40} \Rightarrow m_{2} = \frac{m}{2}$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.