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JAMB Physics 1980 Question 38

Question 38

Magnetism

In the above diagram a straight vertical wire is placed between two opposite magnetic poles which are separated horizontally by a short distance. If a current is passed down the wire, in which direction will the wire move?

Diagram for this question
  1. A.Towards the observer
  2. B.Away from the observer
  3. C.Toward the North pole
  4. D.Towards the South pole
  5. E.Upwards
Show the answer and explanation

Answer: A (Towards the observer)

Explanation

The field runs from N (left) to S (right) and the current flows downwards. Fleming's left-hand rule gives a force out of the page, towards the observer.