The lines of force travel externally in the magnet, i.e., they pass from north pole through the field to south pole.
But these lines of force, as soon as they reach south pole, are not supposed to end there; they are imagined to continue through the magnet, finally reaching that point on the north pole from where they started, thus forming closed curves.
These lines of force imagined existing inside the magnetic material are known as Lines of Induction.
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