Is the magnetic induction line closed

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SUMMARY

Magnetic induction lines are fundamentally closed loops, as established by electromagnetic theory. The discussion highlights a specific scenario involving a ring-form circuit where the magnetic induction line appears to pass through the center, perpendicular to the circuit plane. This line, while seemingly open, is actually considered closed at infinity, as it does not start or end in space. The concept is further illustrated with the magnetic field lines of a bar magnet, reinforcing the principle that magnetic field lines cannot terminate.

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  • Understanding of electromagnetic theory
  • Familiarity with magnetic field concepts
  • Knowledge of ring-form circuits
  • Basic principles of magnetic induction
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  • Research the properties of magnetic field lines in electromagnetic theory
  • Explore the behavior of magnetic fields in ring-form circuits
  • Study the characteristics of magnetic fields around bar magnets
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jomoonrain
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It is said that every magnetic induction line is closed.but recently I happended to find one which isn't.
Consider the magnetic field generated by a ring form circuit, the magnetic induction line which I have found is not closed is the one that go through the center of the circuit,which is normal to the circuit plane.

Am I right? If not, then how to explain it?
 
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If you want to see it that way, it is closed in infinity (something like this with a going to infinity-- never mind the i in there).

What is meant by "magnetic field lines are closed" is that no magnetic field lines can start or end anywhere in space or on a material. Therefore, if they are finite, they have to be closed loops. If they extend to infinity on both sides, they automatically do not begin or terminate anywhere.

Another example would be the field lines along the axis of an ordinary bar magnet (image).
 
thank you very much.i've got it.
 

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