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JAMB Physics 1987 Question 46

Question 46

Current Electricity

A galvanometer of resistance 20 Ω is to be provided with a shunt such that 1/10 of the whole current in a circuit passes through the galvanometer. The resistance of the shunt is

  1. A.2.00
  2. B.2.22
  3. C.18.00
  4. D.18.22
Show the answer and explanation

Answer: B (2.22)

Explanation

The shunt carries 9/10 of the current at the same p.d.: (1/10)I × 20 = (9/10)I × R, so R = 20/9 ≈ 2.22 Ω.