GEOLOGY

Detailed explanation-1: -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-2: -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-3: -The compass should be placed near the north pole of the magnet. The south pole of the needle points towards the north pole of the magnet. We can trace the field lines by moving the compass gradually and drawing a corresponding line which the compass would trace while following a particular line of force.

Detailed explanation-4: -The Geographic North Pole differs from the Magnetic North Pole by about 500 kilometers. The Geographic North Pole is where lines of longitudes converge into what we call the North Pole. The Magnetic Pole is a point in Northern Canada where the northern lines of attraction enter the Earth.