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All about Magnets, Buying and Selling of Magnets, This is a Magnetic
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Types of Magnets
Magnets
have
a
number
of
uses
in
our
modern
world.
There
are
many
manufactures
selling
magnets.
If
you
want
to
buy
magnets,
it
is
important
that
you
know
what
types
of
varieties
of
magnets
there
are.
Only
then
will
you
be
able
to
choose
the
best
manufacturer
selling
magnets.
Following
are
the
different types of magnets found:
•
Permanent
magnets:
This
is
the
most
common
types
of
magnet
that
is
found
in
the
world.
Calendar
magnets
that
people
put
on
their
refrigerators
belong
to
this
category.
The
main
property
of
this
kind
of
magnet
is
that
once
it
has
been
magnetized,
it
retains
a
degree
of
magnetism
in
it
as
long
as
it
lasts.
Ferromagnetic
materials
that
contain
molecules
and
atoms
that
are
positioned
to
reinforce
each
other
are
the
contents
of
permanent
magnets.
Permanent
magnets
can
be
classified
further
into
4
different
categories
based
on
their
properties:
Samarium
Cobalt,
Neodymium
Iron
Boron,
Ceramic
and
Alnico.
The
reason
why
permanent
magnets
are
usually
preferred
to
other
kinds
of
magnets
is
because
they
are
versatile
and
flexible.
It
is
easy
to
mould
them
in
whatever
shape
one
wants.
Permanent
magnets
can
be
shaped
into
rectangles,
donuts,
disks,
round
bars,
horse
shoes,
rings,
houses
and
other
kinds
of
custom
shapes.
The
shape
of
a
magnet
has
a
lot
of
importance
not
only
for
aesthetic
reasons
but
for
the
experiments
that
one
may
do
with
them.
The
way
a
magnet
has
been
magnetized
is
also
important as that is going to determine what kind of uses it will have.
•
Temporary
magnets:
These
are
magnets
which
start
acting
like
permanent
magnets
when
they
are
situated
in
a
strong
magnetic
field.
When
they
are
taken
out
of
the
field,
they
lose
their
magnetism.
Iron
nails
and
paper
clips
are
examples
of
temporary
magnets.
Electric
motors
and
telephones are known to use temporary magnets.
•
Electromagnets:
These
are
the
type
of
magnets
which
have
quite
a
few
industrial
uses.
Telephones,
computers
and
television
have
all
benefited
from
this
kind
of
magnets.
The
strength
of
such
magnets
is
tremendous.
This
is
also
a
kind
of
temporary
magnet.
When
current
flows
through
such
a
magnet,
it
becomes
magnetized.
As
soon
the
current
flow
stops,
it
becomes
demagnetized.
Electromagnets
are
used
in
cranes.
When
the
current
is
switched
on,
cranes
are
used to lift rods and cables for construction purposes.
•
Superconductors:
These
are
the
strongest
kind
of
magnets
found.
Made
from
coils
of
wires,
they
become extremely strong magnets when they are cooled to very low levels of temperature.
How can magnets be demagnetized?
Since
temporary
magnets
get
demagnetized
when
the
electric
flow
is
switched
off
or
they
are
moved
away
from
a
magnetic
field,
the
demagnetization
process
of
permanent
magnets
is
what
is
worth
talking
about.
Permanent
magnets
can
be
demagnetized
by
heat.
When
a
magnet
is
heated
to
a
high
temperature,
it
loses
its
magnetic
properties.
Another
way
is
to
stroke
the
magnet
to
be
demagnetized
with another magnet. The last way to demagnetize is to hammer the permanent magnet.
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