สนามแม่เหล็ก ภาษาอังกฤษ

"David (1904) and Brunhes (1906) first observed magnetizations in lava flows that were roughly opposed to that of the present earth's magnetic field."

"1996, V. R. Khalilov, Electron Strong Magnetic Field, [1988, V. R. Khalilov, Elektroni v silnom magnetom poli, Energoatomizdat, Moscow], Gordon and Breach Science Publishers, page 123, In contrast to the IQHE, the fractional quantum Hall effect occurs in much stronger magnetic fields, and in this case electrons cannot be considered as noninteracting ones."

"The magnetic field B bears the same relation to a hypothetical magnetic charge m as the electric field bears to the electric charge q, so the development of the previous chapter can be taken over completely. The stress tensor for a magnetic field Bᵢ is identical in form to that for the electric field. The energy density is obviously B²/8π and the magnetic field is a physical reality just like the electric field. Electric and magnetic fields superpose linearly[…]. This is perhaps a convenient place to remark that a magnetic field exerts no force whatever on an electric charge."