GEOLOGY

Detailed explanation-1: -Magnetic lines being close together mean a strong magnetic field and lines far apart from each other mean a weak magnetic field. The magnetic field is the strongest at the poles of a magnet, so the lines are closer to each other at poles.

Detailed explanation-2: -It is the magnetic force that attracts and repels. The force is stronger when magnetic objects are closer together. The force weakens when magnetic objects are farther apart. List some examples of how magnets are used in daily life.

Detailed explanation-3: -When opposite poles of the magnets approach, they attract each other. Any north-south combination will pull them together. But when two like poles come together, they push each other apart. Two north poles will not stick together.

Detailed explanation-4: -The magnetic field around a magnet is the strongest at the poles.

Detailed explanation-5: -So if two magnets are pointing with unlike-poles together (north pole to a south pole), then bringing them closer together decreases the energy stored up in the magnetic field. They will be pushed in the direction that decreases the amount of stored-up energy.