Verified Solution • 2025–26 Session moderate

QPages 218-219: Q18: HC Verma: Concepts of Physics - Volume 2 Thermal and Chemical Effects of Electric Current Pages 218-219: Q18 Solution: An electroplating unit plates 3.0 g of silver on a brass plate…

⚠️ Common Exam Traps & Conceptual Pitfalls

The electrochemical equivalent $Z$ is provided in kg/C, so the mass $m$ must be converted from grams to kilograms before substitution; failing to convert $3.0$ g to $3.0 \times 10^{-3}$ kg results in a current value that is 1000 times too large.

An electroplating unit plates 3.0 g of silver on a brass plate in 3.0 minutes. Find the current used by the unit. The electrochemical equivalent of silver is

1.12 \times 10^{-6} \text{ kg C}^{-1}

.

Step-by-Step Verified Solution

**Answer:** Current

\approx 15

A. **Step-by-Step Explanation:**

m = 3.0

g

= 3 \times 10^{-3}

kg,

t = 180

s,

Z = 1.12 \times 10^{-6}

kg/C.

m = ZIt \Rightarrow I = m/(Zt) = (3 \times 10^{-3})/(1.12 \times 10^{-6} \times 180) = 14.88 \approx 15

A .

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