What is the Lorentz force equal to and how is it directed?

The Lorentz force acts on a moving charge in a magnetic field:
Fl = qϑI sin α,
where q is the charge of the particle, ϑ is its velocity, α is the angle between the vectors of velocity and magnetic induction.
The direction of the Lorentz force is determined for a positively charged particle according to the rule of the left hand: if the left hand is positioned so that the lines of magnetic induction enter the palm, the extended four fingers are directed along the speed of movement of the positive charge, then the thumb bent in the plane of the palm by 90 percent will indicate the direction Lorentz forces.

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