When a current is passed through a wire in a magnetic field, a force may be exerted on the wire. This effect is known as the motor effect.
The force can be increased by:
- Increasing the current
- using a stronger magnet
The force depends on the angle between the wire and the magnetic field lines. The force is:
- Greatest when the wire is perpendicular to the magnetic field
- Zero when the wire is parallel to the magnetic field lines.
The direction of the force is always at right angles to the wire and the field lines. Also, the direction of the force is reversed if the direction of the current or the magnetic field is reversed.
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