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JAMB Physics 2001 Question 46

Question 46

Magnetism

The force on a current carrying conductor in a magnetic field is greatest when the

  1. A.conductor makes an angle of 60° with the field
  2. B.force is independent of the angle between the field and the conductor
  3. C.conductor is parallel with the field
  4. D.conductor is at right angles with the field.
Show the answer and explanation

Answer: D (conductor is at right angles with the field.)

Explanation

F = BIL sin θ is greatest when sin θ = 1, i.e. when the conductor is at 90° to the field.