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JAMB Physics 2015 (CBT) Question 2

Question 2

Magnetism

In the diagram above, the direction of the force between N and S in the magnetic field is

Diagram for this question
  1. A.NS
  2. B.SN
  3. C.MP
  4. D.PM
Show the answer and explanation

Answer: C (MP)

Explanation

The field runs from N up to S and the current flows into the paper, so by Fleming's left-hand rule the force is to the right, from M towards P. The field lines are also crowded on the M side, pushing the wire towards P.