Post-UTME Physics 2016 Objective — Question 18
Question 18 of 20 from the Post-UTME Screening (Post-UTME) Physics 2016 Objective paper, with the correct answer and a full explanation.
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What is the time required to electroplate 3.00g of silver onto a brass casting by using a steady current of 15.0A? [e.c.e. of silver = 0.001118gC-1]
- A. 50.01s
- B. 85.21s
- C. 178.89sCorrect
- D. 45.00s
Explanation
t = mass/(e.c.e. x I) = 3.00/(0.001118x15) = 178.89s.
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