Electricity and Magnetism
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anajb
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Electricity and Magnetism
Magnetism
magnets
can be natural or man-made
minerals such iron, nickel and cobalt are magnetic metal
types of magnets
permanent magnets
never lose their magnetism
induced magnets or temporary magnets
have a temporary magnetic force
poles
all magnets have two poles north and south
if you break a magnet in half both parts will have north and south pole
if you suspend a magnet in water it always points to the Earth´s magnetic north pole
if you place two magnets with opposite poles together they will atract each other
if you place two magnets with the same poles together they will repel each other
magnetic field
is the area around a magnet where it exerts its force
the earth is a magnet
the Earth´s molten iron core acts like a huge magnet
the magnetic north pole is a slight angle away from the geographical North Pole
compass
is a navigational instrument
it alwais points to the north
Magnets and electromagnets
magnetic materials
magnetic materials are alwais metalic
not all metals are attracted to magnets
electromagnets
are objects that act like magnets when an electrical current passes through them
the difference between electomagnets and permanent magnets is that electromagnets are activated by electricity