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SIMPLE PHENOMENA OF MAGNETISM - Coggle Diagram
SIMPLE PHENOMENA OF MAGNETISM
properties of magnets
surrounded by a magnetic field
magnetic field goes from north to south
needle of compass points in direction of north pole
has 2 opposite poles (North and South) that exert forces on other magnets
like poles repel
unlike poles attract
attract magnetic materials by inducing permanent or temporary magnetism in them
the side of the material facing the magnet will become the opposite pole of the magnet
exert little to no force on a non-magnetic material
ferrous vs. non-ferrous materials
ferrous materials
magnetic materials
any material containing iron, nickel or cobalt
non-ferrous materials
non-magnetic materials
copper, grass, wood, etc.
magnetization and demagnetization methods
magnetization
stroking object with one end of a magnet in one direction
place a metal in a solenoid and pass direct current through it
demagnetization
smash the magnet with a hammer
heating to a high temperature
place magnet in a solenoid and pass an alternating current
iron vs. steel
iron
soft magnet
magnetizes and demagnetizes easily
temporary magnets (e.g. to lift cars, circuit breakers, transformers)
steel
hard magnet
hard to magnetize and demagnetize
permanent magnets (e.g. fridge magnets, horse shoe magnets)