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JAMB Physics 2009 Question 42

Question 42

Electromagnetic Induction

A band of 500 rectangular loops of wire of area 20 cm by 20 cm, encloses a region of magnetic field which changes from 1.0T to 0.4T within 5 seconds, calculate the induced e.m.f.

  1. A.5.60 V.
  2. B.24.00 V.
  3. C.0.24 V.
  4. D.2.40 V.
Show the answer and explanation

Answer: D (2.40 V.)

Explanation

Area = 0.2 × 0.2 = 0.04 m2. E = NAΔB/Δt = 500 × 0.04 × 0.6 ÷ 5 = 2.4 V.