Q. An ammeter, suspected to give inaccurate reading, is connected in series with a $silver$ voltameter. The ammeter indicates $0.54\ A.$ A steady current passed for one hour deposits $2.0124\ g$ of $silver$. If the E.C.E. of $silver$ is $1.118 \times 10^{- 3}g/C^{- 1},$ then the error in ammeter reading is
A) $+ \ 0.04\ A$
B) $+ \ 0.02\ A$
C) $- 0.03\ A$
D) $- 0.01\ A$
Explanation
(a) $i = \frac{m}{Zt} = \frac{2.0124}{1.118 \times 10^{- 3} \times 3600} = 0.5\ A$
$\Rightarrow$ Error $= 0.54 - 0.5 = 0.04\ A$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.