magnetism |

Objects floating above one another

What is this topic:

Ans: Magnetism

Explain how this happens:

The objects are magnets or have magnets in them. The like poles are facing each other (North pole facing north pole or south pole facing south pole) so they repel each other and float above one another.

Paper clip remains at same position when iron sheet is placed between it and the magnet but floats when iron sheet is being replaced by a wooden plank

What is this topic:

Ans: Magnetism

Explain how this happens:

Although paper clip is a magnetic material, the magnetism or magnetic force of the U-shaped magnet is unable to pass through the iron sheet because iron sheet is a magnetic material, thus unable to attract the paper clip. However magnetism of the U-shaped magnet is able to pass through the wooden plank which is a non magnetic material, thus attracting the paper clip and making it float towards the U-shaped magnet.

Device use for separating iron from sand

What is this topic:

Ans: Magnetism

Explain how this happens:

When the mixture of iron and sand fall onto the belt, they will be carried to the left along the belt since the magnetic wheel is turning anti-clockwise. As the belt travels down towards container X, the sand which is non magnetic material will fall onto container X due to gravity. While the iron which is magnetic material will be attracted by the magnetic wheel as well as the magnet object placed above and between container X and Y. The iron will not fall as the magnetic force is greater than the gravity force acting on them. However once they pass by the magnet object, there is no magnetic force acting on them and they will fall into container Y due to gravity. The process repeats again until all the iron and sand are separated.