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JAMB Physics 2007 Question 19

Question 19

Magnetism

In the diagram above, if the magnetic field points into the paper and the force on a current-carrying conductor points upwards, what is the direction of the current?

Diagram for this question
  1. A.Downwards
  2. B.Right
  3. C.Left
  4. D.Upwards
Show the answer and explanation

Answer: B (Right)

Explanation

Fleming's left-hand rule: point the first finger into the paper (field) and the thumb up (force); the second finger then points to the right, which is the current direction.