Question

the magnetic field lines closed explain​

Answer 1

Answer:

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Answer 2

The direction of a magnetic line at any point gives the direction of the magnetic force on a north pole placed at that point. Since the direction of magnetic field line is the direction of force on a north pole. This means the magnetic field lines are closed.

A more specific explanation is:

They form continuous curves because field lines begin from north and end in south side. This forms closed curves. Magnetic field lines represent continuous curves that originate at the north pole of a magnet and end at the south pole. The magnetic field lines are continuous and thus form closed loops.

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