The ancient Greeks were the first known to have used this mineral, which they called a magnet because of its ability to attract other pieces of the same material and also iron.
Englishman William Gilbert was the first to investigate the phenomenon of magnetism systematically using scientific methods.
The closer the lines, the stronger the magnetic field, so in bar magnet, the magnetic field closest to the poles.
It is equally stronger at both the poles, the force in the middle of the magnet is weaker and halfway between the poles and the centre.
The magnetic field is a vector quantity that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials.
A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to that of the magnetic field.