Page 80 - Science Class 6 Times Publication

4. The magnetic force is strong at the poles and weak at the middle

A magnet has a magnetic force. This force is strong at the poles and
weak at the middle.

Activity 7.5
To show that a magnet has more magnetic force at its poles.

Materials required: A bar magnet, iron llings or iron nails, etc.
Procedure

1. Take some iron llings in a
plate.
2. Roll a bar magnet over the
iron llings and observe.

Observation: You will see that
the iron llings will be stuck to

the two ends of the bar magnet
making a large group. No iron
llings will be stuck in the middle

of the magnet.

Conclusion: The magnetic force is strong at the poles and weak in
the middle.

5. Magnetic poles always exist in pair

A magnet with a single pole is
impossible. It always contains two,
i.e. north and south poles. If a bar
magnet is broken into two pieces,
each piece forms its own north and
south poles and becomes a complete
magnet. If the pieces are further
broken, each new piece will have two
poles again. It means that the poles
of a magnet can never be separated
because they always exist in a pair.

Times' Crucial Science and Environment 76 Book 6