The magnetic field is a field produced by the magnet or electric charges in motion. The magnetic field is the region around a magnetic material or moving electric charge within which the force of magnetism acts. Magnetic fields are represented using magnetic field lines. It is a visual tool used to visualize the direction and the strength of the magnetic field.
Magnetic field lines can be drawn using a compass needle. The compass needle should be placed on a piece of paper near the magnet. Check the direction in which the compass needle points and mark the direction. Move the compass needle to different positions and mark the directions. Joining the points shows the magnetic field lines.
What are the Properties of Magnetic Field Lines
Some important properties of magnetic field lines are listed below –
- The tangent drawn to the magnetic field lines gives the direction of the magnetic field.
- The closeness or density of the field lines is directly proportional to the strength of the field.
- Magnetic field lines appear to emerge or start from the north pole and merge or terminate at the south pole.
- Inside the magnet, the direction of the magnetic field lines is from the south pole to the north pole.
- Magnetic field lines never intersect with each other.
- Magnetic field lines form a closed-loop.
- Field lines have both direction and magnitude at any point on the field. Therefore, magnetic field lines are represented by a vector.
- They denote the direction of the magnetic field.
- The magnetic field is stronger at the poles because the field lines are denser near the poles.