Magnetic flux

surface integral of the magnetic flux density

Magnetic flux is a measure of the magnetic field lines passing through a surface, such as a loop of wire.[1] The magnetic flux through a closed surface such as a sphere is always zero, because the magnetic field lines going into the closed surface are balanced by field lines coming out.[2]

It is the alignment of electrons in the atomic shells of ferromagnets and the “spinning” electrons in electromagnets, that provides a material with it’s magnetism.[3]

The SI unit of magnetic flux is the Weber (Wb; in derived units, volt-seconds). The CGS unit is the Maxwell.

Magnetic flux is sometimes used by electrical engineers designing systems with electromagnets or designing dynamos. Physicists designing particle accelerators also calculate magnetic flux.

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  1. Induction - An Introduction: Crash Course Physics #34, retrieved 2024-02-18
  2. "What is magnetic flux? (article)". Khan Academy. Retrieved 2024-02-18.
  3. "Introduction to Magnetism and Induced Currents". Archived from the original on 2024-02-18. Retrieved 2024-02-18.

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