WORLD OF MAGNETS

MAGNETISM -TYPES, PROPERTIES AND USES

LEARNING OUTCOMES

Ø1. Students will understand the concept of Magnets.

Ø2. Ability to Identify different types of magnets.

Ø3. Familiarize with the various applications of magnets.

 

AN INTRODUCTION TO MAGNETS

Magnets are fun to play with. Magnets are piece of metal or rock with an invisible power to attract special kinds of metal. That power is called a force. Magnetism is the force that makes a magnet stick to your refrigerator. Magnetism is at work all around you. Magnetism works over a distance. This means that a magnet does not have to be touching an object to pull it.

                                                                                                                         

WHAT IS A MAGNET

Magnet is a material that has the property to attract certain materials. It has an invisible field around it, which is called the Magnetic field. A magnet has two poles.

TYPES OF MAGNETS

1. NATURAL MAGNETS    :   They are found in nature and are weak magnets.

2. ARTIFICIAL MAGNETS:  They are made by man by using different techniques and are strong                                                            magnets.

         Natural Magnet 

                                                                       Artificial Magnet                                      

 

Different types of magnets based on shapes:

PROPERTIES OF MAGNETS

• A magnet has two ends called Poles, one of which is called a North pole while the other is called a south pole.
• The north pole of a magnet attracts the south pole of a second magnet, while the north pole of one  magnet repels the other magnet’s North pole.
• Like poles repel, unlike poles attract.
• A magnet creates an invisible area of magnetism all around it called a Magnetic field.
• If you cut a bar magnet in half, you get two brand new, smaller magnets, each with its own north and south pole.

                                                              Attraction- Repulsion 

Magnetic Field

Ø

 

USES OF MAGNETS

 

1. Magnets are used in speakers that convert electricity to sound

2. Magnets are used to close refrigerator doors.

3. A compass shows direction

4. Doctors use Magnetic Resonance Imaging (MRI) scanning to study problems

    In human body.

5. Magnets are used to lift Iron Objects, to separate Iron fillings from other

     Mixtures.

6. Magnetic Trains (Maglev Trains)

                                                                       VIDEOS

TYPES OF MAGNETS

POWERPOINT PRESENTATION

POWERPOINT SLIDES

SUMMARY

The property of an object by which it can attract a piece of Iron or steel is called Magnetism. Those objects which are attracted by a magnet are called Magnetic substances. Natural Magnets occur in nature and are weak, ex: Iodostone whereas an artificial magnet is prepared artificially, ex: bar magnet, U- magnet. Magnets have two distinct poles called the north pole and south pole. Like poles of magnet repel each other, unlike poles repel each other. Monopole does not exist in Magnets. A magnetic field is a region in which a magnetic force can be detected. Magnets are used in speakers, Microphone, Maglev trains, key card, MRI scanner etc.

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