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JAMB Physics 2010 Question 40

Question 40

Magnetism

In the diagram above, if the south-poles of two magnets stroke a steel bar, the polarities at T and V will respectively be

Diagram for this question
  1. A.north and south.
  2. B.south and south.
  3. C.north and north.
  4. D.south and north.
Show the answer and explanation

Answer: C (north and north.)

Explanation

In the divided-touch method, each end of the bar where the stroke finishes gets the opposite polarity to the stroking pole. Both S poles finish at the ends T and V, so both become north poles.