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JAMB Physics 1999 Question 28

Question 28

Magnetism

The diagram above shows a magnet X with its South pole moved along a soft-iron bar PQ in the direction shown. After some time, the poles at P and Q respectively are

Diagram for this question
  1. A.North-North
  2. B.North-South
  3. C.South-North
  4. D.South-South.
Show the answer and explanation

Answer: B (North-South)

Explanation

In single-touch stroking the end where each stroke finishes gets the opposite pole to the stroking pole. The S pole is stroked from Q to P, so P becomes North and Q South.