Electromagnetism

All magnets produce a magnetic field - a region where magnetic materials experience a force.
Field lines go from north to south.
Two like poles repel and unlike poles attract each other.
compasses show the directions of magnetic fields as the north pole of a magnet inside of it is attracted to the south pole of any other magnet. Otherwise they always point north.
Permanent magnets always produce their own magnetic field.
Induced magnets are magnetic materials that turn into a magnet when they are put into a magnetic field.
When a current flows through a wire, a magnetic field is created around the wire in concentic circles perpendicular to the wire.
Changing the direction of the current changes the direction of the magnetic field.
A solenoid is a coil of wire - lots of field lines pointing in the same direction increases the strength of the magnetic field.
A solenoid whith an iron core is called an electromagnetic.
Eletromagnets can be used in scrap yards, or for electric starters/motors.
The motor effect is when a current-carrying wire is put between magnetic poles, the magnetic field around the wire interacts with the magnetic field and exerts a force. (the wire runs perpendicular to the magnetic field at full…

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