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JAMB Physics 1992 Question 37

Question 37

Current Electricity

The diagram above shows a meter bridge in which two of the arms contain resistances R and 2Ω. A balance point is obtained at 60cm from the left end. Calculate the value of R.

Diagram for this question
  1. A.1.2Ω
  2. B.1.3Ω
  3. C.3.0Ω
  4. D.6.0Ω
Show the answer and explanation

Answer: C (3.0Ω)

Explanation

At balance R/2 = 60/40, so R = 2 × 1.5 = 3.0 Ω.