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JAMB Physics 1990 Question 38

Question 38

Current Electricity

When a known standard resistor of 2.0 Ω is connected to the 0.0 cm end of a meter bridge, the balance point is found to be at 55.0 cm. What is the value of the unknown resistor?

  1. A.1.10 Ω
  2. B.1.64 Ω
  3. C.2.44 Ω
  4. D.27.50 Ω
Show the answer and explanation

Answer: B (1.64 Ω)

Explanation

At balance R1/R2 = l1/l2: 2/R = 55/45, so R = 2 × 45/55 ≈ 1.64 Ω.