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JAMB Physics 2003 Question 43

Question 43

Magnetism

The force on a charge moving with velocity v in a magnetic field B is half of the maximum force when the angle between v and B is

  1. A.90°
  2. B.45°
  3. C.30°
  4. D.0°
Show the answer and explanation

Answer: C (30°)

Explanation

F = qvB sin θ, which is greatest at 90°. Half of that needs sin θ = ½, so θ = 30°.