An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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magnetic field line
  خط ِ میدان ِ مغناتیسی  
xatt-e meydân-e meqnâtisi (#)
Fr.: ligne de champ magnétique  

An imaginary line used for representing the strength and direction of a magnetic field. Charged particles move freely along magnetic field lines, but are inhibited by the magnetic force from moving across field lines.

See also: → magnetic; → field; → line.