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
Verified Correct Answer: B.
Physical Principles & Numerical Solution
The greatest force is experienced when the conductor is at right angle to the field.
I.e at perpendicular or Ø = 90^\circ
Source: WAEC / JAMB / NECO Classroom Archive (Record #63323)