A simple rule can be used to find the direction of the force on the conductor when the current is at right angles to the magnetic field.

The displacement of the rod is largest when the direction of current is at right angles to the direction of the magnetic field.

Changing the direction of the magnetic field to vertically downwards results in the reversal of the force acting on the current-carrying rod.

The direction of the force on the conductor is reversed when the direction of current through the conductor is reversed.

The displacement of the rod suggests that a force is exerted on the current-carrying rod when placed in a magnetic field.