Electro Magnetism Essay Example For Students

Electro Magnetism Essay Electromagnetism defined as magnetism produced by an electric current. Inother words it is the electricity part of what holds ourselves and every bit ofmatter in the universe together. This source of universal glue is foundwithin atoms themselves. As the name sounds, there are two different forceswithin electromagnetism the electric force and the magnetic force. Before theearly part of the last century, scientist studied electricity and magnetism asdifferent sciences. No one knew the connection between them. Electromagnetismwas found almost by accident, that a flow of electric current (a movement ofelectrical charge) creates a magnetic force to use the words of Jack R. White, author of The hidden World of Forces. I will first explain the magneticforce in electromagnetism. Nearly 900 years ago, the Chinese discovered thenatural permanent magnet lodestone or magnetite. After playing around withthis rock they discovered that when floating on a piece of wood it would alwayspoint itself north. From this they then created a magnetic compass. To theChinese in that time, magnetic force seemed to be magic, but in the twentiethcentury we use magnetic fields everyday. In such things as the refrigerator, thewashing machine, the dryer, and the vacuum cleaner all have electric motors. Themagnetic force can be created many different ways but the two main ones are:Ferromagnetism caused by the orientation direction of certain kinds ofatoms. Electromagnetism caused by passing an electric current through aconductor such as metal wire Both of these magnetic fields, once created, isexactly the same. Electromagnetic Radiation by definition is thetransmission of ener gy in the form of waves having both an electric and amagnetic component. It is impossible for a wave with just one or the other toexist. The most common forms of electromagnetic radiation are radio waves andlight waves. The Theory of electromagnetic fields was developed by James ClerkMaxwell of Scotland and published in 1865. His work was the first of many otherexperiments and theoretical research that many other well known scientistshave used his works with there own experiments. Maxwell presented a set ofequations that completely describe the electromagnetic field. How it is producedand charged by currents, and how it is distributed in space and time. Accompanying the electric component is a magnetic component which are bothequal. It may be shown that electromagnetic waves transport energy as well ascarry momentum. It way also be shown that any other accelerated charge, notnecessarily a sinusoidal oscillating one, loses energy in the form ofelectromagnetic waves