Q154 / 200 · Manipal (MET) 2012 · Physics
ECE of copper is $3.3 \times 10^{-7} \mathrm{~kg} / \mathrm{C}$. If 100 kWh energy is consumed at 33 V in a copper voltameter, then mass of copper liberated is
- Correct answerA3.6 kg
- B3.3 kg
- C1 kg
- D1 mg
Solution
Mass of copper liberated
$\begin{aligned}
m & =z i t=z\left(\frac{P}{V}\right) t \\
& =\left(3.3 \times 10^{-7}\right)\left(\frac{100 \times 36 \times 10^5}{33}\right) \\
= 3.6 kg
\end{aligned}$
Hence, the correct answer is option: 'A'.