# Encyclopedia Magnetica

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file:motor_force_magnetica_png

Magnetic force in a simple commutated motor follows the right-hand rule: if the index finger shows the direction of electric current $I$ (which moves the electric charge $q$) and the middle finger shows the direction of magnetic field $B$ (flux density), then the thumb shows the direction of magnetic force $F$ acting on the moving charge; the force is proportional to the length of wire $l$ exposed to the magnetic field.

The drawing was inspired by:

motor_force_magnetica.png

You are permitted and indeed encouraged to use this image freely, for any legal purpose including commercial, and with any modifications (the permission is hereby given, so there is no need to ask for it explicitly again), but you MUST always give the following credits:

S. Zurek, Encyclopedia Magnetica, CC-BY-4.0

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