Question

the following statement the magnetic field lines are closed curves please justify it with a solid reason

Answer 1

Outside the magnet the direction of magnetic field lines are from north to south .

And inside the magnet the direction of magnetic field lines are from south to north.

Thus, we can say that magnetic field lines are closed curves.

Hope my answer cleared your doubts! !

Answer 2

Inside a magnet magnetic field lines are from South to north. Outside the magnet they are from north to south. Hence, magnetic field lines are closed loops.