field magnet

noun
a magnet for producing a magnetic field, as in a particle accelerator or an electric motor.

Origin:
1880–85

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
field magnet
 
n
a permanent magnet or an electromagnet that produces the magnetic field in a generator, electric motor, or similar device

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
field magnet  
A permanent magnet used to produce a base magnetic field against which other magnetized materials react, as in the operation of electrical devices such as motors, generators, and solenoids.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In the series motor, the armature and the field magnet are connected electrically in series.
Current flows through the field magnet to the armature, increasing the strength of the magnets.
For a core set of instruments, a steady state, high-field magnet is needed.
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