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Magnetic force, attraction or repulsion that arises between particles because of their motion. It is the responsible for such effects as the action of and the attraction of for. Exist among stationary; both electric and magnetic forces exist among moving electric charges. The magnetic between two moving charges may be described as the effect exerted upon either charge by a created by the other.From this point of view, the magnetic force F on the second particle is proportional to its charge q 2, the magnitude of its velocity v 2, the magnitude of the magnetic field B 1 produced by the first moving charge, and the sine of the angle theta, θ, between the path of the second particle and the direction of the magnetic field; that is, F = q 2 B 1 v 2 sin θ.
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The force is zero if the second charge is travelling in the direction of the magnetic field and is greatest if it travels at right angles to the magnetic field.
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