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Which of the following statements about a straight current-carrying wire placed in a uniform magnetic...

Physics
WAEC 2022

Which of the following statements about a straight current-carrying wire placed in a uniform magnetic field is correct? The wire experiences ---------------

  • A. maximum motor force if the current reverses its direction
  • B. no motor force of it is parallel to the field
  • C. no motor force if it is perpendicular to the field
  • D. a motor force with constant direction if either the current or the magnetic field is reversed
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Correct Answer: Option B
Explanation

The greatest force is experienced when the conductor is at right angle to the field.

I.e at perpendicular or Ø = 90°

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