Answer :

Let C be the Amperian Loop

We know that the angle between B and dl is acute inside the bar and hence is positive

> 0 (i.e. Positive) … (1)

Hence Lines of B run from South Pole (S) to North Pole(N) inside the bar magnet.

From (1) we know

has to be < 0

This can only happen is is negative.

This means that direction of B is from North Pole to South Pole outside the magnet.

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