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Glossary - C |
Capacitor discharge
Calibration
Circuit, closed magnetic
Circuit, open magnetic
Coercimeter
Coercivity
Coil
Compass and pole indicator
Compensated coil
Curie temperature
Curie, Pierre
Capacitor discharge
(See magnetiser)
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Calibration
Magnetic calibration is a way to magnetize and stabilize the magnetic properties of permanent magnet materials and devices to fixed values. This operation eliminates differences between samples due to tolerances on magnetic properties or mechanical and constructive characteristics.
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Circuit, closed magnetic
Circuit where the magnetic flux is conducted continually around a closed path through ferromagnetic materials; for example, a steel ring
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Circuit, open magnetic
Magnetic circuit in which the ferromagnetic material has not a closed external circuit and does not form a complete conducting circuit itself. For example, a permanent magnet ring interrupted by an air gap is an open magnetic circuit.
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Coercimeter
Instrument to measure the normal and intrinsic coercivity of a magnetic material. Generally, the measuring condition are open-circuit condition, with samples in elongated shapes.
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Coercivity
It is the magnetic field intensity Hc at which the magnetisation the ferromagnetic material, previously magnetised to complete saturation, returns to zero. One distinguishes between the coercivity Hcl (at which J = 0) and HcB (at which B = 0).
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Coil
Winding of conductive material in set of turns with the aim of production of magnetic field (magnetization coil, see) or measure magnetic flux (measuring coil, see).
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Compass and pole indicator
The compass indicates the north pole; the pole indicator indicates the polarity of a pole.
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Compensated coil
Special coil that permits to measure only the polarization J of the magnet. A special configuration of windings subtracts the external field H from the total field B.
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Curie temperature
It is the transition temperature above which a material loses its ferromagnetic properties and becomes paramagnetic.
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Curie, Pierre
French physical chemist and cowinner of the Nobel Prize for Physics in 1903. He and his wife, Marie Curie, discovered radium and polonium in their investigation of radioactivity.
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