subject: Magnetism In Grapes - A Science Fair Project for Kids [print this page] Magnetism In Grapes - A Science Fair Project for Kids
To prove that water has diamagnetic properties with the help of grapes.
Materials Required:
1.Two Grapes- considerably large in size.
2.Straw made of plastic.
3.A metallic container with lid.
4.A drawing pin.
5.A knife or a razor blade or a prick.
6.Magnet made from neodymium
Procedure:
1.Take the drawing pin and insert it from underneath the lid such that the pin is projecting out, vertically.
2.Make a small hole (of size 0.5cm * 1 cm) in the straw at the centre using either a soldering iron or a prick or knife.
3.Shove one grape on each end of the straw and balance the straw on the pin by inserting the pin in the hole.
4.Take the magnet and bring one of its poles close to the grape. Maintain some distance between the grape and the magnet.
5.The grape will experience some force due to the magnet's repelling effect and it slowly begins to move away.
6.Take the magnet away from the grapes and let it come to rest.
7.Now bring the other pole of the magnet near the grape. We will see that the grape is again repelled by the magnet. It is seen that both the poles repel the grape.
Scientific explanation:
Magnetic materials (which have some magnetic properties) are of three types: Ferromagnetic, Paramagnetic and Diamagnetic.
1. Ferromagnetic: These are those materials which are attracted strongly by the magnet. These are the ones which can form permanent magnets. They are attracted by both poles of the magnet. Example- Iron.
2. Paramagnetic: These are inferior to ferromagnetic materials and are attracted by both poles of magnet feebly. Example- Aluminum.
3. Diamagnetic: The materials with diamagnetic properties are repelled by both poles of the magnet. The force of repulsion is very weak (a hundred thousand times weaker than what ferromagnetic material experiences). Water, the main constituent of grapes is a diamagnetic substance and so the grapes experience a feeble repulsion when magnets are brought close to the grapes.
3. Diamagnetic: The materials with diamagnetic properties are repelled by both poles of the magnet. The force of repulsion is very weak (a hundred thousand times weaker than what ferromagnetic material experiences). Water, the main constituent of grapes is a diamagnetic substance and so the grapes experience a feeble repulsion when magnets are brought close to the grapes.
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