Magnetic Field - Law Dictionary Search Results
Home Dictionary Name: magnetic fieldParamagnetism
A property of materials which are not magnetized in the absence of an external magnetic field but in which the magnetic moments of their constituents align with and enhance an applied magnetic field the induced magnetic field of the substance is in direct proportion to the strength of the applied magnetic field opposed to diamagnetic and contrasted with ferromagnetic...
magnetic force
The force caused by a magnetic field a force which affects objects having a magnetic field and objects in which a magnetic field can be induced such as ferromagnetic substances a magnetic force manifests itself as an attraction for iron It is associated with electric currents and moving charged paticles as well as permanent magnets...
magnetic field
The space around a magnet through which it exerts magnetic force a field of force surrounding a permanent magnet electrical current or a moving charged particle called also magnetic flux and field of magnetic force...
magnetosphere
the magnetic field of a planet the volume around the planet in which charged particles are subject more to the planets magnetic field than to the solar magnetic field...
nuclear magnetic resonance
The specific absorption and re emission of electromagnetic radiation at characteristic wavelengths by atomic nuclei in a magnetic field It is abbreviated NMR The wavelength of the radiation absorbed depends on the type of nucleus the intensity of the magnetic field and the local chemical environment in which the nucleus resides It is the latter effect called the chemical shift by which atoms of specific elements in different chemical compounds show a different resonance frequency which gives rise to the greatest utility of this phenomenon in analyzing the chemical structure of substances Similar effects of the chemical environment permit the discrimination of different types of living tissue by virtue of their different chemical composition thus permitting utilization of the phenomenon in medical diagnostic instruments especially for magnetic resonance imaging...
magnetic resonance
A phenomenon resulting from quantization in the magnetic field of electrons or atoms or molecules or nuclei exposed to an external magnetic field by which a narrow frequency band of radio waves may be absorbed and re emitted by the object...
Gauss
The CGS unit of density of magnetic field equal to a field of one line of force per square centimeter being thus adopted as an international unit at Paris in 1900 sometimes used as a unit of intensity of magnetic field It was previously suggested as a unit of magnetomotive force...
magnetic resonance imaging
a medical diagnostic procedure utilizing the phenomenon of nuclear magnetic resonance to generate images of internal parts of the body It depends on the differential absorption of electromagnetic radiation by different types of living tissue in a magnetic field It is complementary to X ray imaging in that the softer tissue show more prominently in magnetic resonance images rather than bone as with X rays It is a non invasive procedure allowing such images to be obtained without penetration of the tissue by objects It is abbreviated MRI As with computerized tomography the results are usually presented as images of sequential planar sections of that part of the body of concern to the physician...
magnetic dipole moment
A physical quantity associated with the magnetic field of a dundamental particle as An orbiting electron in an atom will have a magnetic dipole moment...
magnetic field strength
The amount of magnetic flux in a unit area perpendicular to the direction of magnetic flow...
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