# Magnetic Field Lines

Magnetic field lines: Magnetic field lines are some closed curve lines drawn in the magnetic field and a tangent drawn on any line at a point gives the direction of magnetic field at that point. They are a visual tool used to represent magnetic fields. They describe the direction of the magnetic force on a north monopole at any given position. The magnetic lines of force show where the magnetic field exits the substance at one pole and reenters the material at another pole along the length of the magnet.

Magnetic lines of force have a number of significant properties, which contain:

• They seek the path of smallest amount resistance between opposite magnetic poles. In a single bar magnet, as shown to the right, they endeavor to form closed loops from pole to pole.
• A magnetic field line is a closed and continuous curve.
• They never cross one another.
• They all have the same strength.
• Their density decreases when they move from an area of higher permeability to an area of lower permeability.
• Their density decreases with increasing distance from the poles.

Magnetic field lines or lines of force are the imaginary lines introduced by Michael Faraday (1791-1867) to visualize magnetic field. Lines of force are a graphical representation of a field. The lines of force are the path along which an isolated unit the North Pole would move along in the field.