When a curent flows in the wire, a force is exerted on the magnet on the top pan balance and a reading on the balance can be recorded. If the current is reversed, the balance shows a negative value, showing that the force on the magnets reverses. The force also reverses if the field direction is reversed.
If a bigger current is passed through the wire the force is bigger and a larger reading is observed on the balance.

The size of the force depends on:

the size of the current (this can be increased by increasing the voltage from the power supply)

the length of conductor in the field

the strength of the magnetic field (this can be increased by using stronger magnets)

the angle between the conductor and the flux lines: F is a maximum if the angle is 90° and is zero if the angle is 0°