When is the force experienced by a current-carrying conductor placed in a magnetic field largest?

The force experienced by a current-carrying conductor placed in a magnetic field is largest when the directions of the electric current and magnetic field are perpendicular to each other.

Explanation

Experiments have shown that the force experienced by a current-carrying conductor or the displacement of the rod is the largest (or the magnitude of the force is the highest) when the direction of the electric current and magnetic field are perpendicular to each other (or at right angles, 90°).