Page 142 - Science Class 06

PROPERTIES OF MAGNET
Some important proper es of magnets are:
v Magnets a ract objects of iron, cobalt
and nickel.
v The force of a rac on of a magnet is
greater at its poles than in the middle.
v Like poles of two magnets repel each
other.
v Opposite poles of two magnets a racts
each other.
v If a bar magnet is suspended by a
thread and if it is free to rotate, its
South Pole will move towards the North
Pole of the earth and vice-versa.
Aim : To show a bar magnet always take
north-south direc on.
Materials required : A bar magnet, a
magne c compass and a thread.
Method : Suspend a bar magnet
horizontally with the help of a thread.
Turn the direc on of the pole of the
magnet and leave it. When the magnet
come to rest, you will no ce that it takes
the north-south direc on. Repeat the
ac vity two or more mes. You will
observe that the result is the same. It
shows that a bar magnet takes north-
south direc on.
Aim : To show like pole of a magnet
repels and unlike pole a racts each
other.
Materials required : Two bar magnets and
a wooden table.
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Method : Firstly, iden fy the north and
south poles of both the magnets with the
help of the ac vity you did previously.
Paste slips marked “N” on the north pole
and “S” on the south pole in both the
magnets. Now, place one magnet on the
table horizontally. Take the other magnet
and bring its north pole near to the north
pole of the other magnet. You will
observe that both the magnets repel
each other. Now, bring the south pole of
the magnet near to the north pole of the
other magnet. This me you will observe
that both the poles a ract each other.
1. Why is a bar magnet more ac ve at its
poles?
2. How does a bar magnet help us to locate
direc ons?
3. Write any three materials which can be
magne sed.
MAGNETIC COMPASS
The magne c compass is the most well-
known of all instruments used in finding
direc on. It is the oldest naviga onal
instrument and has been aiding sailors to
cross the seas for many centuries. Mariners
use magne c compasses to fix a ship’s
posi on on a chart
by using it to take
bearings of visible
objects as well as
allowing them to
steer a par cular
course.
Magne c Compass
Science-6