When a current flows through a wire, a magnetic field will be produced around the wire. The interaction between this magnetic field and a second magnetic field (either that produced by permanent magnets or by a second current-carrying conductor) causes a force to be exerted on the wire. We call this the motor effect.
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current, amp, ampere, wire, north pole, south pole, magnetic force, lines of magnetic flux, magnetic flux lines, motor effect, electromagnetism, magnetic field, magnetic flux density, magnetic field lines, solenoid, electromagnet, Fleming's left-hand rule, tesla