M AGNETISM

L EARNING O BJECTIVES At the end of the lesson, the students should be able to: Define a magnet State that a magnet has two poles State the properties of a magnet Observe 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

D EFINE A MAGNET What is a magnet? Have you ever seen a magnet before?

D EFINE A MAGNET Observe!

D EFINE A MAGNET Do you know that a magnet has two poles? - North pole and South pole. What is a pole? - The end of the magnet.

D EFINE A MAGNET A 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

BAR MAGNET

E XAMPLES OF MAGNETS HORSESHOE MAGNETS

E XAMPLES OF MAGNETS RING MAGNETSA 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 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 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 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 MAGNETS Activity 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 MAGNETS Household applications & Entertainment Refrigerator magnets Magnets in loudspeakers

APPLICATIONS OF MAGNETS Transportation Maglev trainsCar alternator

APPLICATIONS OF MAGNETS Medicinal purposes – MRI (Magnetic Resonance Imaging)

APPLICATIONS OF MAGNETS Others 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 other Unlike poles attract each other

L EARNING O BJECTIVES At the end of the lesson, the students should be able to: Define a magnet State that a magnet has two poles State the properties of a magnet Observe 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