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JAMB Physics 1982 Question 39

Question 39

Magnetism

A magnetic needle is suspended first at the earth's north magnetic pole and then at a point on the magnetic equator. The respective angles between the needle and the horizontal are

  1. A.0° and 0°
  2. B.60° and 60°
  3. C.90° and 90°
  4. D.90° and 0°
  5. E.0° and 90°.
Show the answer and explanation

Answer: D (90° and 0°)

Explanation

At a magnetic pole the earth's field is vertical, so the needle dips 90°. At the magnetic equator the field is horizontal, so the angle of dip is 0°.