Magnetic forces - Magnetic forces Magne ic Force The...

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1/22/12 Magnetic forces 1/4 h\perph\sics.ph\-astr.gsu.edu/hbase/magnetic/magfor.html#c1 MagneWic Force The 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 sinș where ș is the angle < 180 degrees between the velocity and the magnetic field. This implies that the magnetic force on a stationary charge or a charge moving parallel to the magnetic field is zero. 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 . When the magnetic force relationship is applied to a current-carrying wire , the right-hand rule may be used to determine the direction of force on the wire. 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.
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This note was uploaded on 01/28/2012 for the course PHYSICS 334 taught by Professor Leslierosenberg during the Winter '12 term at University of Washington.

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Magnetic forces - Magnetic forces Magne ic Force The...

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