# Magnets

Topics: Magnetic field, Magnet, Ferromagnetism Pages: 3 (893 words) Published: April 23, 2013
Background Research Paper on Magnets for Science Fair
Magnets are used in daily life. We use magnets for various things. For example, magnets are used on refrigerators, school projects, etc. You may not know this but magnets are very useful. Earth itself is a magnet. A magnet is a material that can exert a noticeable force on other materials without actually contacting them (http://www.madehow.com/Volume-2/Magnet.html#b). The noticeable force is called a magnetic force and they may either attract or repel. There are different properties for magnets. All magnets have two poles: north and south. Like poles repel and unlike poles attract. Magnets attract material like iron, steel, nickel, and cobalt. The stronger the poles are then the larger the attraction or repulsive force between them will be. A repulsive force is the force by which bodies repel each other. The closer magnets are then the greater the force will be (http://www.miniphysics.com/2011/08/properties-of-magnets.html).

There are other magnets in the world but they are called electromagnets. They are made by surrounding certain materials with a coil of wire. When there is an electric current passed through the coil, the materials exert a magnetic force (http://www.madehow.com/Volume-2/Magnet.html#b). When the current is cut off, the magnetic force of the materials drops to zero. Electromagnet materials retain little magnetic properties without a flow of electric current in the coil.

A magnetic field is the space surrounding a magnet in which magnetic force is exerted. The motion of negatively charged electrons determines the polarity and strength of the magnet (http://tuhsphysics.ttsd.k12.or.us/Research/IB09/HougBlat/index.htm). Magnets are filled with magnetic lines of force. The lines of force originate in the North Pole and continue to the South Pole. The higher the heat of the magnet is, then the greater the energy and movement of particles. Cold temperatures slow down the movement of...