WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709

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
JAMB CBT 2024 - Candidates, Schools, Centres, Resellers - Get Ready!
JAMB CBT Mobile App 2024 - Free Download
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
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


Report an Error Ask A Question Download App
JAMB CBT 2024 - Candidates, Schools, Centres, Resellers - Get Ready!
JAMB CBT Mobile App 2024 - Free Download
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995

Contributions ({{ comment_count }})

Please wait...

{{ settings.no_comment_msg ? settings.no_comment_msg : 'There are no comments' }}

Quick Questions

Post your Contribution

Please don't post or ask to join a "Group" or "Whatsapp Group" as a comment. It will be deleted. To join or start a group, please click here

{{ quote.posted_by.display_name }}
{{ settings.form_textarea_description }}
 
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
JAMB CBT Mobile App 2024 - Free Download
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
JAMB CBT 2024 - Candidates, Schools, Centres, Resellers - Get Ready!
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
JAMB CBT 2024 - Candidates, Schools, Centres, Resellers - Get Ready!
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
JAMB CBT Mobile App 2024 - Free Download