The edges of this bar magnet are rectangular in shape and hence the name rectangular bar magnet. There are two types of the bar magnet, they are:-ġ) Rectangular bar magnet: This magnet has four rectangular faces painted and two square shape poles.
Hence, a bar magnet can therefore be used to find the direction same as a compass. The magnetic dipoles inside the bar magnet experience the magnet force due to the Earth’s magnetic field and align in the direction of the field. On hanging freely in the air, the bar magnet aligns itself in the North-south direction. What is a Bar MagnetĪ magnet appearing like a bar, and hence called a bar magnet has two poles, the poles of the bar magnet are protected from demagnetizing the magnet using iron plates on both the poles.Ī bar magnet is composed of ferromagnetic material that retains its magnetic properties even in the absence of an external field and hence is a permanent magnet. The magnetic field caused by the presence of the bar magnet is extreme at the edges of the poles and is very poor at the middle of the bar magnet. They flow from the south pole to the north pole within a material and north pole to south pole in air.In this article, we are going to see what is the magnetic field around a bar magnet and Where is the magnetic field of a bar magnet strongest.They are considered to have direction as if flowing, though no actual movement occurs.Their density decreases with increasing distance from the poles.Their density decreases (they spread out) when they move from an area of higher permeability to an area of lower permeability.In a single bar magnet as shown to the right, they attempt to form closed loops from pole to pole. They seek the path of least resistance between opposite magnetic poles.Magnetic lines of force have a number of important properties, which include: Â General Properties of Magnetic Lines of Force (See section on circular magnetism for more information). However, it is important to understand that the magnetic field can flow in loop within a material. The value of such a magnet where the magnetic field is completely contained with the material probably has limited use. If a bar magnet was placed across the end of a horseshoe magnet or if a magnet was formed in the shape of a ring, the lines of magnetic force would not even need to enter the air. However, since the poles are located closer together and a more direct path exists for the lines of flux to travel between the poles, the magnetic field is concentrated between the poles. The magnetic lines of force flow from pole to pole just like in the bar magnet. The horseshoe magnet has north and south poles just like a bar magnet but the magnet is curved so the poles lie in the same plane. Magnets come in a variety of shapes and one of the more common is the horseshoe (U) magnet. Magnetic Fields in and around Horseshoe and Ring Magnets 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. 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. It should be noted that the magnetic lines of force exist in three dimensions but are only seen in two dimensions in the image. 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. The particles align themselves with the lines of magnetic force produced by the magnet. A magnetograph can be created by placing a piece of paper over a magnet and sprinkling the paper with iron filings. The magnetic field surrounding a bar magnet can be seen in the magnetograph below. Magnetic Field In and Around a Bar MagnetĪs discussed previously, a magnetic field is a change in energy within a volume of space. Understand the important properties possessed by magnetic lines of force.Describe magnetic fields in different shaped magnets.After reading this section you will be able to do the following:
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