The magnetic field lines inside a bar magnet

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are from the south pole to the north pole of the magnet

are from north pole to south pole of the magnet

do not exist

depends upon the area of cross-section of the bar magnet

answer is A.

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Detailed Solution

The magnetic field lines inside a bar magnet are from the south pole to the north pole of the magnet.
Magnetic field lines are almost parallel to each other. A bar magnet consists of a uniform ferromagnetic material with a constant magnetic permeability over its entire length and bulges when the imaginary magnetic field lines run in the opposite direction to the poles. Inside the bar magnet, the magnetic field lines continue to travel to the other side(from the south pole to the north pole).

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