Which of the following statements about a straight current-carrying wire placed in a uniform magnetic field is correct? The wire experiences —————
- maximum motor force if the current reverses its direction
-
no motor force of it is parallel to the field
- no motor force if it is perpendicular to the field
- a motor force with constant direction if either the current or the magnetic field is reversed
The correct answer is: B
Explanation
The greatest force is experienced when the conductor is at right angle to the field.
I.e at perpendicular or Ø = 90°