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Magnetic Force on Electric Current
An electric current will create a magnetic field that will exert a magnetic force on a magnet when its placed in close proximity to that current. By Newton's Third Law of Motion, this magnet should be able to exert an equal and opposite magnetic force on the current. Indeed, a magnetic field does in fact exert a magnetic force on a current-carrying wire. The direction of this magnetic force can be determined using the right hand rule (right hand rule # 2). We point our fingers in the direction of the electric current and then bend our fingers in the direction of the magnetic field. If we extend our thumb, it will point in the direction of the magnetic force. To determine the magnitude of this force, we multiply the electric current by the cross product of the length vector (section of wire exposed to the magnetic field) and the magnetic field vector.
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