Video encyclopedia

Magnetic field


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A magnetic field is a vector field that describes the magnetic influence of electrical currents and magnetized materials. In everyday life, the effects of magnetic fields are most readily encountered with nearby permanent magnets, which pull on magnetic materials and attract or repel other magnets. Magnetic fields surround and are created by magnetized material and by moving electric charges such as those used in electromagnets. Magnetic fields exert forces on nearby moving electrical charges and torques on nearby magnets. In addition, a magnetic field that varies with location exerts a force on magnetic materials. Both the strength and direction of a magnetic field varies with location. As such, it is an example of a vector field.
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  • History 

  • Definitions, units, and measurement 

  • Magnetic field lines 

  • Magnetic field and permanent magnets 

  • Magnetic field and electric currents 

  • Relation between H and B 

  • Energy stored in magnetic fields 

  • Electromagnetism: the relationship between magnetic and electric fields 

  • Important uses and examples of magnetic field