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Magnetic ForceThe magnetic field B is defined from the Lorentz Force Law, and specifically from the magnetic force on a moving charge:  The implications of this expression include: 1. The force is perpendicular to both the velocity v of the charge q and the magnetic field B. 2.
The magnitude of the force is F = qvB sin 3. The direction of the force is given by the right hand rule. The force relationship above is in the form of a vector product. From the force relationship above it can be deduced that the units of magnetic field are Newton seconds /(Coulomb meter) or Newtons per Ampere meter. This unit is named the Tesla. It is a large unit, and the smaller unit Gauss is used for small fields like the Earth's magnetic field. A Tesla is 10,000 Gauss. The Earth's magnetic field is on the order of half a Gauss.
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