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