Question

In a bar magnet, why magnetic field lines move from north pole to south pole outside the bar magnet ? Why magnetic field lines move from south pole to north pole inside the bar magnet ?​

Answer 1

Explanation:

What is the direction of magnetic field lines outside the bar magnet?

It's a convention that magnetic field lines are drawn from north to south. Because we have defined the magnetic field lines to show the direction of the magnetic force on a north pole. Hence, they are defined as north to south. P.S.: The field lines don't "repel" from north pole or "attract" to south pole.

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