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JAMB Physics 2001 Question 48

Question 48

Electromagnetic Induction

Energy losses through eddy currents are reduced by using

  1. A.low resistance wires
  2. B.insulated soft iron wires
  3. C.few turns of wire
  4. D.high resistance wires.
Show the answer and explanation

Answer: B (insulated soft iron wires)

Explanation

A core made of insulated soft-iron wires (or laminations) breaks up the paths of eddy currents, so less energy is lost as heat.