Question

The degree of closeness of magnetic field lines represents the relative strength of the magnet. What it mean?

Answer 1

The intensity of a magnetic field can be seen from the magnetic field lines. If the lines are closer, it means the intensity of the field is strong in that region and wherever the lines are far apart, the intensity of field is weak. So for any magnet, the field lines gives us an idea of how intense magnetic field can the magnet produce. The intensity determines the strength of the magnet.