pole piece

noun Electricity.
a piece of magnetic material at a pole of a permanent magnet or of an electromagnet, shaped to control the magnetic flux distribution in the vicinity of the pole.

Origin:
1880–85

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World English Dictionary
pole piece
 
n
electrical engineering a piece of ferromagnetic material forming an extension of the magnetic circuit in an electric motor, etc, used to concentrate the magnetic field where it will be most effective

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Example sentences
The lower pole piece can be seen in position in the middle of the magnet.
The six racetrack coils are wound around a pole piece made of iron in the center and aluminum at each end.
WD is the distance between the sample surface and the lower surface of the pole piece.
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