Magnets and Magnetic Fields Magnetic Forces

Is the force a magnet exerts on another magnet, on iron or a similar metal, or on moving charges. - acts over a distance and varies over a distance as well.

Magnetic Forces Magnetic Poles: two regions where the magnet’s force is strongest. The one is the North and the other is the South. The direction of magnetic force between two magnets depends on how the poles face. Like magnetic poles repel one another, and opposite magnetic poles attract each other.

Magnetic Fields Magnetic Field: surrounds a magnet and can exert magnetic forces. –A magnetic field, which is strongest near a magnet’s poles, will either attract or repel another magnet that enters the field.

Magnetic Field Around the Earth Magnetosphere: The area surrounding earth that is influenced by this field. – Geographic North pole is 90 degrees. –Magnetic North pole is 81 degrees North.

Magnetic Materials Iron, Nickel, and Cobolt have strong magnetic fields. Magnetic Domains: is a region that has a very large number of atoms with aligned magnetic fields. Ferromagnetic Material: such as iron, can be magnetized because it contains magnetic domains. When a material is magnetized, most of its magnetic domains are aligned.

Nonmagnetized Materials Just because something is ferromagnetic doesn’t mean that it is magnetized. If the domains of the material are not aligned and they are randomly aligned, the magnetic capabilities are cancelled out.

Magnetized Materials Some materials can become magnetized by being placed in the magnetic field of another magnetic, but it then loses it magnetic capabilities. This is known as a temporary magnet. When a material holds it aligned domains for longer periods of time, it is known as a permanent magnet.