Page 74 - Science Class 6 Times Publication

Chapter
Chapter

7 MAGNET

Estimated periods:5

OBJECTIVES

At the end of the lesson, the students will be able to :
Ü dene natural and articial magnets;

Ü identify the magnetic and non-magnetic substances;

Ü xplain the properties and uses of magnets.

e
MIND OPENERS
Ü Have you ever seen or used a magnet?
Ü Where is a magnet used?
Ü What is a magnet made of? Discuss.
Introduction

A magnet looks like iron but it has a power of attracting iron pieces
toward itself. Ancient people learnt about magnetism from loadstones,
naturally magnetized pieces of iron ore. They are the naturally
created magnets, which attract pieces of iron. The word magnet in
Greek meant “stone from magnesia”, a part of ancient Greece where
loadstones were found. It is claimed that magnets were discovered
and were in use in Greece and China 2500 years ago. The loadstone
(lodestone) is also called magnetite. Ancient Chinese navigators
used magnetite to know the directions, especially during the cloudy
weather.

Magnets have very useful attractive property. Hence, they are being used
extensively in different devices. A magnet is used in radio, transistor,
television, speaker, motor pump, electric generator, etc. A magnet can
be used to collect the pieces of iron spread on the ground. Doctors can
use magnet to remove iron pieces if they enter into our eyes.

Magnets have a special property which is known as magnetic property
or magnetism. A freely suspended magnet always comes to rest

Times' Crucial Science and Environment 70 Book 6