The force on a current-carrying wire is a maximum when the current is moving parallel to a magnetic field. true or false

The force is given by F=iL*B where i is current, L is the path the current follows (the wire path) and B is the magnetic field. Also recall that the * symbol is the vector cross product, which can be expressed by the sine of the angle between the vectors L and B. Therefore we can also say F=iLBsin (θ). Do you know what value of θ makes sin (θ) the largest? This will tell you if parallel or perpendicular makes the force strongest. For one value of θ it will be zero, and for the other it will be maximized.