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In copper plating, a current of 0.5A is allowed for cathode area of 100cm2. If...

Physics
JAMB 1982

In copper plating, a current of 0.5A is allowed for cathode area of 100cm2. If this current is maintained constant for 100 minutes, the thickness of the copper deposited will be approximately (the electrochemical equivalent of copper = 0.0003g/oC, density of copper = 10^4g/cm3 )

  • A. 10-2mm
  • B. 10-3mm
  • C. 10-4mm
  • D. 10-5mm
  • E. 10-6mm
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Correct Answer: Option E
Explanation

m = Itz

density = \(\frac{\text{mass}}{\text{area x thickness}}\)

Density = \(\frac{Itz}{A \times h}\)

\(10^4 = \frac{0.5 \times 100 \times 60 \times 0.0003}{100 \times h}\)

h = 9 x 10-7cm = 9 x 10-6mm


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