Notes from united streaming on magnets

Magnet are used everyday but have been around

Greeks- rocks contained magnetite

China- hung magnet from the string, found it would always point to the north pole. It si called lodestone

All magnets have a magnetic force, pulling or pushing the north and/or south pole

Opposites attract or pull together

Push apart- repel

Opposites attract

Magnetic forces are the strongest at the magnetic poles

Permanent magnets: horseshoe, bar, disc (all have north and south poles)

Magnetic lines of force act like it has a bar magnetic at the core to create a line of field

Earth is made of iron and nickel

Before they used lodestone to tell direction but now they use compasses.

Approximately 1500 kilometers off of the geographic N and S

Jupiter’s magnetic field is 10 times stronger than the Earth’s. Saturn also has a strong magnetic field.

Magnetic lines of force (the magnetic field) have broken through the sun’s corona creating the sun spots

All matter is made of atoms

Nucleus is at the center

protons are nuclear particles that are positive charge

orbiting the nucleus is the electron carrying a negative charge

all spin around creating a magnetic field making each atom a tiny magnet

magnetic domain is when all of the thousands of atoms are arranged int eh same direction therefore are magnetic

ferromagnetic material is very strong magnetic material

magnets can be made from any ferromagnetic material. Most magnets are man-made today

temporary magnets is when you rub material together against the same pole of a magnet

permanent magnets can become demagnetize but tend to stay magnetized

heating a magnet can knock a magnet out of alignment

when you break a magnet in half, it becomes 2 smaller magnets

Hans Christian Urstead, a Danish scientist, discovered that when you place a compass next to a wire that carries electricity, the compass needle was change when the electricity was on.

Compass needle was only deflected by a magnetic field an electric current produced a magnetic field

Electricity and magnetism- Urstead found the relationship between the two. Major discovery- electromagnetism

Electromagnets are a ferromagnets with electric wire around the material. It is strongest at the center, and at the ends or poles.