Magnetic flux density and the force on a current and a moving charge, fields around currents, magnetic flux, and Faraday's and Lenz's laws of induction.
Force on a current-carrying conductor
A current in a magnetic field experiences a force:
where is the magnetic flux density (tesla, T), the current, the length in the field and the angle between the current and the field. The force is maximum when the current is perpendicular to the field () and zero when parallel. Fleming's left-hand rule gives the direction (thumb = force/motion, first finger = field, second finger = current).
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