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JAMB Physics 2004 Question 46

Question 46

Magnetism

To protect a material from the influence of an external magnetic field, the material should be kept in a

  1. A.square steel ring.
  2. B.loop of copper wire.
  3. C.triangular zinc ring.
  4. D.soft iron ring.
Show the answer and explanation

Answer: D (soft iron ring.)

Explanation

Soft iron is very permeable, so the field lines pass through the ring instead of the space inside it (magnetic shielding).