MAGNETISM

LEARNING OBJECTIVES At the end of the lesson, the students

should be able to:Define a magnetState that a magnet has two polesState the properties of a magnetObserve the magnetic field pattern

Around a magnet Between two like poles arranged end to end Between two unlike poles arranged end to end

State and describe some applications of magnets in their everyday life

DEFINE A MAGNET What is a magnet?

Have you ever seen a magnet before?

DEFINE A MAGNETObserve!

DEFINE A MAGNETDo you know that a magnet has

two poles?- North pole and South pole.

What is a pole?- The end of the magnet.

DEFINE A MAGNETA magnet is a solid which attracts

magnetic materials or objects and points north-south direction when suspended.

A magnet is a material that produces a magnetic field.

A magnet is a piece of material that attracts metal.

DIFFERENT KINDS OF MAGNETS

DIFFERENT KINDS OF MAGNETS

BAR MAGNET

EXAMPLES OF MAGNETS

HORSESHOE MAGNETS

EXAMPLES OF MAGNETS

RING MAGNETS A ROD MAGNET

PROPERTIES OF A MAGNET

A magnet exerts a magnetic force.

When a bar magnet is freely suspended, the bar magnet points to north-south direction.

PROPERTIES OF A MAGNET

Properties Of a Magnet.flv

Watch this video…

PROPERTIES OF A MAGNET Attractive property

A magnet attracts magnetic substances like iron, steel, nickel and cobalt.

Directive property A freely suspended magnets always point

to the north-south direction.

Poles exist in pairs A magnet contains two poles i.e. North

pole and South pole Magnetic property is maximum at its poles.

LAWS OF MAGNETISM

Law Of Magnetism.flv

Pay attention…And listen what the man has to say…

LAWS OF MAGNETISM

Like poles repel each other.

Unlike poles attract each other.

MAGNETIC FIELDS

What is the magnetic field_.flv

Observe this video and take note of the lines of forces.

Reminder:

The lines of the magnetic field is called the lines of forces.

APPLICATIONS OF MAGNETSActivity

In groups of four or five, give a list of uses of magnets in your everyday life.

You are given 3 minutes for discussion.

Then choose a leader from your group to state one use of the magnet and explain its importance to your everyday life.

APPLICATIONS OF MAGNETSHousehold applications & Entertainment

Refrigerator magnets Magnets in loudspeakers

APPLICATIONS OF MAGNETSTransportation

Maglev trains Car alternator

APPLICATIONS OF MAGNETSMedicinal purposes – MRI (Magnetic Resonance

Imaging)

APPLICATIONS OF MAGNETSOthers

Door Stopper Electric motor

SUMMARY OF THE LESSON A magnet is a solid which attracts

magnetic materials or objects and points north-south direction when suspended.

A magnet has two poles – North pole & South pole.

The properties of a magnet are Attractive property Directive property Poles exist in pairs

SUMMARY OF THE LESSON

Laws of magnetism states that:-Like poles repel each otherUnlike poles attract each other

LEARNING OBJECTIVES At the end of the lesson, the students

should be able to:Define a magnetState that a magnet has two polesState the properties of a magnetObserve the magnetic field pattern

Around a magnet Between two like poles arranged end to end Between two unlike poles arranged end to end

THE END