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JAMB Physics 1999 Question 36

Question 36

Electromagnetic Induction

The core of an efficient transformer should consist of laminated pieces of metal in order to

  1. A.increase the heat produced by increasing the eddy current
  2. B.increase the heat produced by reducing the eddy current
  3. C.reduce the heat produced by increasing the eddy current
  4. D.reduce the heat produced by reducing the eddy current.
Show the answer and explanation

Answer: D (reduce the heat produced by reducing the eddy current.)

Explanation

Insulated laminations break up the paths of eddy currents, so less current flows in the core and less energy is wasted as heat.