GEOLOGY

Detailed explanation-1: -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: -Magnetic poles are the points where the magnetic field lines begin and end. Field lines converge or come together at the poles.

Detailed explanation-3: -The degree of closeness of magnetic field lines indicates the strength of the magnetic field. The magnetic field lines are denser near the poles of a magnet where the magnetic field is stronger and they are far separated near the mid-point of the magnet where the magnetic field is weaker.

Detailed explanation-4: -The magnetic field lines show the direction in which the magnetic force is acting at any particular point. The density of the magnetic field lines shows the strength of the magnetic force acting. If the lines are close together the magnetic force is great, if the lines are spread out the force is weak.