Is the magnetic induction line closed

AI Thread Summary
Magnetic induction lines are fundamentally closed loops, meaning they cannot start or end in space. The discussion highlights a specific case involving a ring circuit where a magnetic induction line appears to go through the center, raising questions about its closure. It is clarified that while such lines may seem open, they can be considered closed at infinity, as they do not terminate anywhere. The concept emphasizes that all magnetic field lines must either form closed loops or extend infinitely without beginning or ending. This understanding aligns with the behavior of magnetic fields around bar magnets and other configurations.
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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