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JAMB Physics 1993 Question 45

Question 45

Alternating Current Circuits

Determine the inductive reactance when a 30.0 mH inductor with a negligible resistance is connected to a 1.30 × 103 Hz oscillator.

  1. A.39.0Ω
  2. B.122.5Ω
  3. C.245.0Ω
  4. D.39000.0Ω
Show the answer and explanation

Answer: C (245.0Ω)

Explanation

XL = 2πfL = 2 × 3.142 × 1300 × 0.030 ≈ 245.0 Ω.