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  2. Magnetic flux - Wikipedia

    en.wikipedia.org/wiki/Magnetic_flux

    The magnetic flux is the net number of field lines passing through that surface; that is, the number passing through in one direction minus the number passing through in the other direction (see below for deciding in which direction the field lines carry a positive sign and in which they carry a negative sign). [2]

  3. Magnetic field - Wikipedia

    en.wikipedia.org/wiki/Magnetic_field

    (This definition of magnetic flux is why B is often referred to as magnetic flux density.) [35]: 210 The negative sign represents the fact that any current generated by a changing magnetic field in a coil produces a magnetic field that opposes the change in the magnetic field that induced it.

  4. Magnetic susceptibility - Wikipedia

    en.wikipedia.org/wiki/Magnetic_susceptibility

    Magnetic susceptibility is a dimensionless proportionality constant that indicates the degree of magnetization of a material in response to an applied magnetic field. A related term is magnetizability, the proportion between magnetic moment and magnetic flux density. [3]

  5. Permeability (electromagnetism) - Wikipedia

    en.wikipedia.org/wiki/Permeability...

    Paramagnetic materials are attracted to magnetic fields, hence have a relative magnetic permeability greater than one (or, equivalently, a positive magnetic susceptibility). The magnetic moment induced by the applied field is linear in the field strength, and it is rather weak. It typically requires a sensitive analytical balance to detect the ...

  6. Force between magnets - Wikipedia

    en.wikipedia.org/wiki/Force_between_magnets

    The validity of Ampère's model means that it is allowable to think of the magnetic material as if it consists of current-loops, and the total effect is the sum of the effect of each current-loop, and so the magnetic effect of a real magnet can be computed as the sum of magnetic effects of tiny pieces of magnetic material that are at a distance ...

  7. Magnet - Wikipedia

    en.wikipedia.org/wiki/Magnet

    The tesla is equivalent to the magnetic flux (in webers) per unit area (in meters squared), thus giving B the unit of a flux density. In CGS, the unit of B is the gauss (G). One tesla equals 10 4 G. The magnetic field H is given in SI units of ampere-turns per meter (A-turn/m).

  8. Faraday's law of induction - Wikipedia

    en.wikipedia.org/wiki/Faraday's_law_of_induction

    The Maxwell–Faraday equation (listed as one of Maxwell's equations) describes the fact that a spatially varying (and also possibly time-varying, depending on how a magnetic field varies in time) electric field always accompanies a time-varying magnetic field, while Faraday's law states that emf (electromagnetic work done on a unit charge when ...

  9. Faraday paradox - Wikipedia

    en.wikipedia.org/wiki/Faraday_paradox

    The induced electromotive force in any closed circuit is equal to the negative of the time rate of change of the magnetic flux enclosed by the circuit. [ 2 ] [ 3 ] This version of Faraday's law strictly holds only when the closed circuit is a loop of infinitely thin wire, [ 4 ] and is invalid in other circumstances.