GEOLOGY

Detailed explanation-1: -They are continuous closed curves. They originate from the North Pole and terminate at the South Pole. Two lines do not intersect each other. They are crowded where the magnetic field is strong, i.e. near the poles.

Detailed explanation-2: -Magnets have two poles; the field lines spread out from the north pole and circle back around to the south pole.

Detailed explanation-3: -Field lines exit the magnet at its north pole, travel around in the air, and re-enter the magnet through its south pole.

Detailed explanation-4: -Magnetic field lines in a bar magnet start from the north pole and end at the south pole. The direction of the magnetic field is tangential to the field line at all points in space. The field lines do not intersect each other. The field lines form closed loops.

Detailed explanation-5: -The lines of magnetic field from a bar magnet form closed lines. By convention, the field direction is taken to be outward from the North pole and in to the South pole of the magnet. Permanent magnets can be made from ferromagnetic materials.