The Lorentz Force - Maglab U. - Forida State and Lawrence Livermore

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Lorentz Force

"A charged particle moving through a magnetic field experiences a force that is at right angles to both the direction in which the particle is moving and the direction of the applied field. This force, known as the Lorentz force, develops due to the interaction of the applied magnetic field and the magnetic field generated by the particle in motion. The phenomenon is named for Dutch physicist Hendrik Lorentz, who developed an equation that mathematically relates the force to the velocity and charge of the particle and the strength of the applied magnetic field.


The Lorentz force is experienced by an electric current, which is composed of moving charged particles. The individual magnetic fields of these particles combine to generate a magnetic field around the wire through which the current travels, which may repel or attract an external magnetic field."

You can predict which way the wire will move by using the left-hand rule. You need to contort your hand in a bit of an unnatural position for this rule: If your index finger points in the direction of a magnetic field, and your middle finger, at a 90 degree angle to your index, points in the direction of electrical current, then your extended thumb (forming an L with your index) points in the direction of the Lorentz force exerted upon that particle


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