A magnetic field is the magnetic effect of electric currents and magnetic materials. The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field.
The magnetic moment of a magnet is a quantity that determines the torque it will experience in an external magnetic field. A loop of electric current, a bar magnet, an electron (revolving around a nucleus), a molecule, and a planet all have magnetic moments.
2. Relating to the magnetic poles of the earth: a magnetic compass bearing.
Magnetism is a class of physical phenomena that are mediated by magnetic fields. Electric currents and the magnetic moments of elementary particles give rise to a magnetic field, which acts on other currents and magnetic moments. Every material is influenced to some extent by a magnetic field.
Pulses of strong magnetic fields are used in FMRI (functional magnetic resonance imaging) for monitoring brain activity and in MRI for imaging tissues throughout the body.
Define magnetic: of or relating to a magnet or magnetism—magnetic in a sentence.
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Magnetic currents are therefore not essential to this phenomenon. Magnetic storms cause irregular variations sometimes of one or two degrees.
The magnetic field B is defined from the Lorentz Force Law, and specifically from the magnetic force on a moving charge: The implications of this expression include