Magnets
Kassie Johnson
What is a magnet?
A magnet is a device that attracts iron and produces a magnetic field. Inside of a magnet is the magnetic field which makes it pull or push an object to or away from it. Magnets are made of iron.
http://www.google.com/#q=define+magnets&safe=active
http://answers.yahoo.com/question/index?qid=20120528111324AASK2wz
Picture of magnetic field
What is the magnetic field?
The magnetic field is generated when electrons move through an electrical conductor. The magnetic field is the space around a magnet. The shape of the field is shown by the filings. When lines are closer together, the domain is stronger.
http://whatis.techtarget.com/definition/magnetic-field and notes
What is magnetic forces?
A magnetic force is similar to electrical forces. Both kinds of forces cause objects to attract or repel. There is a north and south on every magnet. Like poles repel each other, opposite poles attract.
(Notes)
These are three of the many uses that have magnetism in them
Use 1 (loudspeakers and headphones)
Magnets are used in loudspeakers and headphones because to listen to music through these, an electrical signal is passed through a coil of wire. The coil is inside a magnetic field.
http://wiki.answers.com/Q/What_are_magnets_used_for_in_every_day_life_and_how#slide=4m
Use 2
Magnets are used in televisions. Inside there are ray tubes and it shoots electrons toward the screen which gives us the image and words on tv. When the electrons are shot towards the tv screen, they will hit the screen in a straight line. I'm guessing they are in a straight line, because it will make the force stronger when it hits.
Use 3
Credit cards have magnetism in them too. They may not have much, but they do have a strip/stripe of a magnet on the back of the card. This stripe is made up of tiny iron- based particles that more in a plastic form. (In this picture, the magnet strip is the black line at the top.
http://money.howstuffworks.com/personal-finance/debt-management/magnetic-stripe-credit-card.htm