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JAMB Physics 2004 Question 20

Question 20

Magnetism

A moving-coil galvanometer has a full-scale deflection of 3A equivalent to 30° deflection. The sensitivity of the instrument is

  1. A.10.0.
  2. B.33.0.
  3. C.90.0.
  4. D.0.1.
Show the answer and explanation

Answer: A (10.0.)

Explanation

Sensitivity is deflection per unit current: 30° ÷ 3 A = 10° per ampere.