State two properties of magnetic lines of force?

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After reading this section you will be able to do the following:

• Describe magnetic fields in different shaped magnets.
• Understand the important properties possessed by magnetic lines of force.

As discussed previously, a magnetic field is a change in energy within a volume of space. The magnetic field surrounding a bar magnet can be seen in the magnetograph below. A magnetograph can be created by placing a piece of paper over a magnet and sprinkling the paper with iron filings. The particles align themselves with the lines of magnetic force produced by the magnet. The magnetic lines of force show where the magnetic field exits the material at one pole and reenters the material at another pole along the length of the magnet. It should be noted that the magnetic lines of force exist in three dimensions but are only seen in two dimensions in the image.

It can be seen in the magnetograph that there are poles all along the length of the magnet but that the poles are concentrated at the ends of the magnet. The area where the exit poles are concentrated is called the magnet's north pole and the area where the entrance poles are concentrated is called the magnet's south pole.

Magnetic Fields in and around Horseshoe and Ring Magnets

General Properties of Magnetic Lines of Force

Magnetic lines of force have a number of important properties, which include:

• They seek the path of least resistance between opposite magnetic poles. In a single bar magnet as shown to the right, they attempt to form closed loops from pole to pole.
• They never cross one another.
• They all have the same strength.
• Their density decreases (they spread out) when they move from an area of higher permeability to an area of lower permeability.
• Their density decreases with increasing distance from the poles.
• They are considered to have direction as if flowing, though no actual movement occurs.
• They flow from the south pole to the north pole within a material and north pole to south pole in air.

Review:

1. Magnetic lines of force exist in three dimensions but are only seen in two dimensions in typical depictions.
2. Magnets come in a variety of shapes and one of the more common is the horseshoe (U) magnet.
3. Magnetic field lines never cross one another.

Write any three properties of magnetic lines of force.

List the properties of magnetic lines of force.

state two properties of magnetic lines of force.

Properties of magnetic lines of force:-

1. Magnetic lines of force (or magnetic field lines) are closed continuous curves. They start from the North Pole and end at the South Pole.
2. The tangent at any point on a magnetic line of force gives the direction of the magnetic field at that point.
3. No two magnetic lines of force can intersect each other.
4. Magnetic lines of force are crowded where the magnetic field is strong, and they are far from each other where the field is weak.

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