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JAMB Physics 2004 Question 43

Question 43

Current Electricity

If 16mA of current flows through a conductor in one second, the number of electrons transported per second is [1 electronic charge = 1.6 × 10−19C]

  1. A.1.00 × 1020.
  2. B.1.00 × 1017.
  3. C.2.56 × 10−17.
  4. D.2.56 × 10−18.
Show the answer and explanation

Answer: B (1.00 × 1017.)

Explanation

n = It/e = 16 × 10−3 × 1 ÷ 1.6 × 10−19 = 1.0 × 1017.