07. Magnets
2 mins read

07. Magnets

Magnets have the special property of attracting things towards its direction. Only some materials are attracted to a magnet.

Objects use in magnets

Chess board

pencil case

Different types of magnets

  1. Horse shoe magnet
  2. Bar magnet
  3. U magnet
  4. Ring magnet
  5. Tabular magnet

Magnetic poles

The area with a higher magnetism is known as the poles of a magnet.

Attractive power of the magnet is more at the ends than the middle. There are two poles of a magnet.

  1. North pole
  2. South pole

Poles of a magnet

Activity

Spread the file clips evenly on the piece of cardboard. Then slowly lower the magnet towards the piece of cardboard.

Observation

More file clips near the two ends of the magnet.

The behaviour of a magnet

Magnets always stays still in between North and South.

Activity

Mark the North and South on the table. Hang the magnet steadily form the string to the stand. After that let the magnet to be still. Find the direction to which the magnet has stopped.

Observation

Magnet lies still between the North and South.

Activity

Cut the piece of regiform. Keep the bar magnet on the piece of regiform and let it float on the water.

Observation

Magnet lies still between the North and South.

We can easily find the North and South poles of a magnet with the help of a compass. The pilots, sailors, explorers and soldiers use the compass to find their direction.

Interactions between the poles of magnets

Activity

Fix the magnet A. After becomes still bring the magnet B towards it.

Observation

Same magnetic poles repel each other. Different magnetic poles attract each other.

Magnetic forces

Activity

Keep the bar magnet under the paper and spread the iron fillings on the sheet of paper. Tap the paper slowly.

Observation

The area which the magnetism is spread around the magnet is called the magnetic field.

Demonstrating the magnetism

Activity

Take one magnet at a time and hang each of the nails. Count the number of nails hung on each magnet.

Observation

Magnet which bears the most number of nails has the highest magnetic power.

Activity

Make a small boat and keep it on water. Fix the magnet to the iron rod. Move it near the boat.

Having powerful magnets closer by may cause damages to computer, television, mobile phones and land phones.

The magnetic poles of tabular magnets and barium ferrite magnets are on top and bottom sides and not at the two ends.

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