February 13, 2012

6.12 Motor effect

Recall that a force is exerted on a current-carrying wire in a magnetic field, and how this effect is applied in simple dc electric motors and loudspeakers

Motor effect: The fact that a wire carrying a current perpendicular to a magnetic field will experience and force (mutually perpendicular to both the field and the current)
What this means is that when a wire carrying a current is passed through a magnetic field a force is applied on the wire such that it exits the magnetic field and no longer “cuts” the field. This is because the electromagnetic field surrounding the wire is repelled by the field in the permanent magnet

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