Solenoids – Physics coursework

Solenoids Permanent Magnet- Magnetic scene of action.http//www.diracdelta.co.uk/science/ parentage/m/a/ magnetized%20 cogitation/source.html Magnets put on deuce poles called unification and South.Similar (like) charismatic poles repel. dis exchangeable magnetic poles attract. A magnet attracts a piece of iron. The more or less important of the two properties of attraction and repulsion is repulsion. The only demeanor to tell if an object is enchantd is to contrive if it repels an early(a) magnetised object. The strength and educational activity of a magnetic land is represent by magnetic field literary arguments. Field lines by convention go from North to South. A magnetic field is three-dimensional, although this is not often seen on a order of payment of magnetic field lines.Electromagnets A magnetic field exists around all wires carrying a reliable. When there is no on-going the procure needles in the diagram shown line up with the Earths magnetic field. A wate rcourse by means of the wire produces a circular magnetic field. See what happens when there is a current in the wire. The magnetic field for a drum roll of wire is shown below. The magnetic handle from each of the turns in the coil gibe together, so the total magnetic field is much 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/revision/1/slideshow-1/2/An electromagnet consists of a coil of wine, through and through which a current can be passed, wrapped around a easygoing iron core. This core of magnetic literal increases the strength of the field due to the coil. spongy iron is easily magnetised, and easy to demagnetise- it does not retain its magnetism after 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 persisten t magnets. The strength of an electromagnet depends onThe size of the current flowing through the coil The material body of turns in the coil The material inner of the coil Heinmann physics Do primary(prenominal)s http//hyperphysics.phy-astr.gsu.edu/hbase/solids/ferro.htmlc4Ferromagnetic materials exhibit a long-range ordering phenomenon at the nuclear level which causes the unpaired electron spins to line up parallel with each other in a region called a domain. Within the domain, the magnetic field is intense, plainly in a bulk exemplar the material will usually be unmagnetized because the many domains will themselves be helter-skelter 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, unless that in the absence of external magnetic fields those domains are randomly oriented. A modest applied magnetic field can cause a larger degree of alignm ent of the magnetic moments with the external field, giving a large generation of the applied field.FerromagnetismIron, nickel, cobalt and some of the disused earths (gadolinium, dysprosium) exhibit a unique magnetic behavior which is called ferromagnetism because iron (ferrum in Latin) is the most common and most dramatic example.