KNOWLEDGE IN MAGNETS-PART 1
KNOWLEDGE IN MAGNETS-PART 1
“In our lifetime we all are played with magnets at a once (or) You might have seen magnets and have even enjoyed playing with them.”
How Magnets Were Discovered
There was a shepherd named Magnes, who
lived in ancient Greece.
He used to
take his herd of sheep and goats to the
nearby mountains for grazing.
He would take a stick with him to
control his herd. The stick had a small
piece of iron
attached at one end.
One day he
was surprised to find that he had to
pull hard to free his stick from a rock
on the
mountainside.
It seemed to be the stick was being
attracted by the rock.
The rock was a
natural magnet and it attracted the
iron tip of the shepherd's stick. Such rocks were given
the name magnetite, in case
after the name of that shepherd.
Magnetite
contains iron. Some people believe
that magnetite was first discovered at a
place
called Magnesia.
This
substance having the property of attracting
iron are known as magnets.
Making magnets from
pieces of iron was discovered. These are
known as artificial magnets.
Nowadays
artificial magnets are prepared
in different shapes for example,
bar magnet, horseshoe magnet, cylindrical or
a ball-ended magnet.
DO EXPERIMENT:
Take a plastic or a
paper cup. Fix it on a stand with the help of
a clamp.
Place a magnet inside
the cup and cover it with
a paper so that the magnet is not
visible.
Attach a thread to a clip made
of iron.
Fix the other end of the
thread at the base of the stand. (Mind you,
the trick involved here, is to keep the
length of the thread sufficiently short.)
Bring the clip near the base of the cup.
The clip is raised in air without support, like a kite.
MAGNETIC AND NONMAGNETIC
MATERIALS:
The materials which get
attracted towards a magnet are magnetic – for
example,
iron, nickel or
cobalt.
The materials which are not
attracted towards a magnet are nonmagnetic - for example,such as plastic.
HOW TO FIND A DIRECTIONS USING MAGNETS:
Magnets were known to
people from ancient times. Many
properties of magnets were also
known to them.
You might have read many
interesting stories about the uses
of magnets.
One such story is about an
emperor in China named Hoang Ti.
He had a chariot with a
statue of a lady that could rotate in any
direction. It had an
extended arm as if it
was showing the way.
The statue had an interesting property.
It would rest in such a position that
its extended arm always pointed towards
South.
By looking at the
extended arm of the statue, the Emperor
was able to locate directions when he
went to new places on his chariot.
***PART 2 LINK***
Superb I was really amazed about it article.
ReplyDelete