Transcript magnetism - BotsRule

MAGNETISM
MAGNETISM
• Magnetism is the force where objects
are attracted or repelled to one another
• Usually these objects are metals such
as iron.
MAGNETISM
• Every magnet has two poles. This is
where most of its magnetic strength is
most powerful.
• These poles are called north and south
or north-seeking and south seeking
poles.
MAGNETISM
• When the north pole of one magnet is
placed near the north pole of another
magnet, the poles are repelled. When
the south poles of two magnets are
placed near one another, they also are
repelled from one another. When the
north and south poles of two magnets
are placed near one another, they are
attracted to one another.
MAGNETISM
• In other words ….
• Like poles repel. Opposite poles attract.
MAGNETISM
• The attraction or repelling of two
magnets towards or against one
another depends on how close they are
to each other and how strong the
magnetic force is within the magnet.
The further apart the magnets are the
less they are attracted or repelled to
one another.
MAGNETISM
• When a magnet is broken into little
pieces, each piece, regardless of how
big or small, has its own north and
south poles.
MAGNETISM
• There is a strong connection between
electricity and magnetism. With
electricity, there are positive and
negative charges. With magnetism,
there are north and south poles.
MAGNETISM
• An important difference between
electricity and magnetism is that in
electricity it is possible to have
individual positive and negative
charges. In magnetism, north and south
poles are always found in pairs.
MAGNETISM
• In the same way north and south poles
will set up magnetic fields, electric
charges create electric fields around
them.
MAGNETISM
• Magnetic field lines are closed loops,
extending from the south pole to the
north pole and back again, While
electric field lines begin on positive
charges and end on negative charges.
MAGNETISM
• Electric fields come from charges or
currents, which are simply a whole
bunch of moving charges.
MAGNETISM
• In a permanent magnet, the magnetic
field comes from the motion of the
electrons inside the material.