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: -Outside the magnet, the magnetic lines of forces pass from north pole to the south pole and inside the magnet, they pass from south to the north pole.

Detailed explanation-3: -Magnetic field lines appear to move from the South pole towards the North pole inside a magnet.

Detailed explanation-4: -Inside a bar magnet, since magnetic field are continous, they point from the south pole to the north pole as the magnetic enters from south pole from the outside and emerge from the north pole.