1. The current (I) is at its maximum: The force is directly proportional to the current. A higher current means a stronger force.
2. The magnetic field strength (B) is at its maximum: The force is also directly proportional to the magnetic field strength. A stronger magnetic field results in a stronger force.
3. The wire is perpendicular to the magnetic field lines: The force is maximized when the angle between the wire and the magnetic field lines is 90 degrees. The force decreases as the angle deviates from 90 degrees, becoming zero when the wire is parallel to the field lines.
In summary:
The force on a current-carrying wire in a magnetic field is maximized when the current, the magnetic field strength, and the angle between the wire and the field lines are all at their maximum values.