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JAMB Physics 1994 Question 46

Question 46

Magnetism

Which of the following are found in the receiver but not in the microphone of a telephone handset? I. Diaphragm II. Soft iron pole pieces III. Permanent magnet IV. Carbon blocks

  1. A.I and II
  2. B.I and IV
  3. C.II and III
  4. D.III and IV.
Show the answer and explanation

Answer: C (II and III)

Explanation

Both parts have a diaphragm. The earpiece (receiver) has a permanent magnet with soft-iron pole pieces and coils; the carbon granules are in the microphone.