GEOLOGY

Detailed explanation-1: -Magnetic field lines are the imaginary lines around a magnet which gives us the pattern of magnetic field of the magnet. These lines don’t start or end. They form a closed loop. They flow from North pole to South pole outside the magnet, while they flow from South pole to North pole inside the magnet.

Detailed explanation-2: -The magnetic field lines originate from the south pole and terminate at the north pole of the magnet.

Detailed explanation-3: -The direction of the magnetic field is taken to be the direction in which a north pole of the compass needle moves inside it. Therefore it is taken by convention that the field lines emerge from north pole and merge at the south pole.

Detailed explanation-4: -The two ends of a magnet are called poles and are always different from each other. The end that points north, if allowed to move freely, is called the north pole. The other end is the south pole. These magnetic poles behave rather like electric charges.