Magnetic field and field lines
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Magnetic field
Magnetic field
A magnetic field is a
Magnetic field lines
Magnetic field lines
Field lines/Magnetic flux lines/Magnetic field lines are imaginary lines visualizing a magnetic fields direction and strength. They show how a magnetic force would act on a magnetic material or moving charge.
They always point from the N pole to the S Pole outside a magnet.
In a magnet, they loop back from S to N, always forming closed loops. Unlike electric field lines (starts at '+', ends at '–'), magnetic field lines have no start or end (no magnetic "monopoles" found yet).
They never cross each other. Otherwise, 2 different forces at a point--impossible.
They show strength:
Closer lines = stronger field (e.g., near a magnet’s poles).
Spread-out lines = weaker field (e.g., far from a magnet).
Monopoles
Monopoles
Monopoles are (as yet) theoretical objects with either a north (N), or a south (S) pole or magnetic charges, like protons and electrons.
Their existence is disputed, though some prove that they can be artificially synthesized. They are still useful for thinking of magnetic field lines and to or conceptualize ideas about magnetism. Note monopoles reduce magnetic phenomena to their electrostatic analogue. We can say that the magnetic field lines emerge out of north poles and converge at south poles.
If monopoles are isolated in nature, they would be found to undergo similar interactions in the electric field as an electric charge undergoes in a magnetic field. For example, the magnetic field of monopoles and the electric field of charges would exhibit the same behavior, and a moving magnetic monopole would induce a circulating electric field (diagram below).
References
References
[1] Magnetic field - Wikipiedia
[2] Magnetic field line - Wikipedia
Quizzes
Quizzes
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