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
Correct answer is B
The greatest force is experienced when the conductor is at right angle to the field.
I.e at perpendicular or Ø = 90°