ElectroMagnetism

Our lesson for this week is electromagnetism.At first more than 2000 years ago the
greeks discovered a mineral that attracts things made of iron.This mineral was found in a place in Turkey.
Thus it was called Magnesia,but the greeks called it magnetite.But today we call it the magnet.
Magnets have two poles.The magnet exerts forces on each other and its surrounded by a magnetic field.
And if you bring two magnets close together it will exert magnetic force.The magnet has the north and south
pole.And the groups of atoms are in tiny areas are called Domains.The north and south pole line up together
to make up a strong magnetic field.Domains are like tiny magnets of different sizes within an object.The magnetic field is the region in which the magnetic forces act.
Also when you cut a magnet in half.You end up having two magnets not one.
FerroMagnets -metals made with these metals have strong magnetic properties.

ElectroMagnet-a magnet  made by electric current and it usually has an iron core.

Electromagnetism is the interaction between electricity and magnetism.Using electromagnetism the
magnetic field is generated by  an electric current in a wire  that can move a compass needle.
The discovery  of  electromagnetism was discovered by the danish scientist by Hans Christian Oersted.
He was the one who discovered the relationship between electricity and magnetism in 1820.
He noticed that when the compass was close to the wire.The compass needle no longer pointed north
.And then he discovered that a compass needle was a  magnet.It moves from its north south orientation
only when it is in a magnetic field different from  Earth's.
Solenoid is a coil of wire that produces  a magnetic field when carrying a electric current.The magnetic
field of a solenoid is very similar to the field of a bar magnet.