Solenoids – Physics coursework

Solenoids Permanent Magnet- Magnetic Field.http//www.diracdelta.co.uk/science/source/m/a/ magnetized%20 demesne/source.html Magnets have ii poles called North and South.Similar (like) charismatic poles repel. Unlike charismatic poles attract. A magnet attracts a piece of straighten out. The most important of the two properties of attraction and repulsion is repulsion. The only way to tell if an object is spellbind is to see if it repels a nonher magnetised object. The strength and direction of a magnetised field is represented by magnetised field lines. Field lines by convention go from North to South. A magnetic field is three-dimensional, although this is not often seen on a drawing of magnetic field lines.Electromagnets A magnetic field exists around all wires carrying a latest. When thither is no current the compass needles in the diagram shown line up with the Earths magnetic field. A current through the wire produces a circular magnetic field. See what happens when ther e is a current in the wire. The magnetic field for a bun of wire is shown below. The magnetic fields from each of the turns in the coil add together, so the total magnetic field is more than stronger. This produces a field which is similar to that of a bar magnet. A coil of wire like this is often called a solenoid.http//www.bbc.co.uk/bitesize/standard/physics/using_electricity/movement_from_electricity/ alteration/1/slideshow-1/2/An electromagnet consists of a coil of wine, through which a current can be passed, wrapped around a soft iron core. This core of magnetic material increases the strength of the field due to the coil. cracked iron is easily magnetised, and easy to demagnetise- it does not retain its magnetism subsequently the current is switched off. Steel, on the other hand, is hard to magnetise and demagnetise, and so it retains in magnetism. It is used for permanent magnets. The strength of an electromagnet depends onThe size of the current satiny through the coil The number of turns in the coil The material interior of the coil Heinmann physics Domains http//hyperphysics.phy-astr.gsu.edu/hbase/solids/ferro.htmlc4Ferromagnetic materials exhibit a long-range ordering phenomenon at the atomic level which causes the unpaired electron spins to line up line of latitude with each other in a region called a domain. inside the domain, the magnetic field is intense, but in a bulk pattern the material will usually be unmagnetized because the many domains will themselves be randomly oriented with respect to one another. The main implication of the domains is that there is already a high degree of magnetization in ferromagnetic materials within individual domains, but that in the absence of external magnetic fields those domains are randomly oriented. A modest apply magnetic field can cause a larger degree of continuative of the magnetic moments with the external field, giving a large multiplication of the applied field.FerromagnetismIron, nickel, cobalt and some of the rare earths (gadolinium, dysprosium) exhibit a unique magnetic behavior which is called ferromagnetism because iron (ferrum in Latin) is the most common and most striking example.