Fun With Magnets

i. bar magnet, horse shoe, cylindrical

ii. Magnetic

iii. Magnetic

iv magnet

v. two.

i. False, Each magnet has two poles i.e., north and south.

ii. True, It is said that first magnet was discovered by shepherd named magnes, who lived in Greece.

iii True, Each magnet has two poles. Similar poles of a magnet repel each other.

iv. False, maximum iron filling get stick up at the two ends of the magnet.

v. True, Magnets always point towards North-south direction when suspended freely in the air.

vi. True, compass can used to find out direction at any place.

vii False, Rubber is not a magnetic material.

A pencil sharpener get attracted by both the poles of a magnet although its body is made up of plastic because some part of it is made up of Iron.

Properties of a magnet:

i. Magnet has two poles- North and South.

iii. Magnet attracts materials like iron, nickel and cobalt known as magnetic materials

iv. Opposite poles of two magnets attract each other whereas like poles repel each other.

Bar magnet has two poles which are located at two ends of the bar magnet.

These two poles are: North pole and south pole. The figure given below shows how unlike poles (North & South) attract each other:

Magnets always point towards North-south direction when suspended freely in the air. We can find out a direction by freely suspending a bar magnet. The end magnet of the magnet that point towards North is called North pole. The other pole that point towards the South is called South pole.

To make iron strip into a magnet, we

1. Put an iron strip on the table.
2. Now, take a bar magnet and place one of its poles on one end of the iron strip. Without lifting the bar magnet, move it along the length of iron strip till we reach the other end.
3. Now, lift the magnet and bring the pole (the same pole we started with) to the same point of the iron strip from which we began.
4. Repeat this process about 30-40 times. Bring some iron fillings near the iron strip and if the strip attracts the fillings then we interpret that that iron strip has become a magnet.

A compass is usually a small box with a glass cover on it. It is always used to find directions. The compass always shows North and South directions. The compass is kept at the place, where we wish to know the direction. Its needle indicates the North-South direction, when it comes to the rest. The compass is then rotated until the North and South marked on the dial are at the two ends of the needle.