GSEB Solutions for Class 6 Science and Technology – Magnet (English Medium)
When a hand is placed on the lower side of the cardboard, the pins remain in the same position.
When a magnet is placed on the lower side of the cardboard, the pins get attracted to it and cluster at a point. If we move the magnet placed below the cardboard, the pins also move with the magnet.
There is no change in the position of the needle when the steel glass is slowly raised upwards.
The needle rises as the glass with a magnet placed in it is raised up. If the glass is further raised, the needle stands vertically as shown in the figure. We see that the needle stands vertically even though there is no contact between the glass and the needle. This occurs due to the magnetic force of the magnet kept in the glass.
Nails, screws, nuts, pin, cycle key, iron ruler, nickel vessel, needle, etc. are objects which are attracted by a magnet.
Sand, aluminum, copper vessel, glass, ball pen, plastic, leaf, stone, plastic, thread, etc. are objects which are not attracted by a magnet.
The objects attracted by magnets are mostly made up of iron. Magnets also attract objects which are made up of nickel and cobalt.
The small particles lying on the ground which stick or get attracted towards the magnet maybe finite iron filings or small iron particles or particles of an iron mineral called magnetite or small particles of meteors falling on the Earth.
When a magnet is moved over some iron filings which are spread on a paper, the iron filings get deposited on the ends of the magnet as shown in the given figure.
These ends of the magnets are known as the poles of the magnet.
A freely suspended bar magnet will come to rest in the North-South direction.
Even when the bar magnet is rotated, every time the magnet will come to rest in the North-South direction only.
When the North Pole of a bar magnet is brought close to the North Pole of another magnet, then the two magnets move away from each other.
Thus, we can conclude that like poles (N-N and S-S) of two magnets repel each other.
When the North Pole of a bar magnet is brought close to the South Pole of another magnet, then the two magnets move near each other.
Thus, we can conclude that unlike poles (N-S and S-N) of two magnets attract each other.
The poles of the given ring magnet are opposite to each other. This can be found by freely suspending the ring magnet as shown in the given image.
The North Pole of the ring magnet will come to rest in the North direction and the South Pole of the magnet will come to rest in the South direction.
Iron nails, pins, knife, screw, blades, pliers, screw driver, refrigerator door, pair of tongs, cycle key, iron ruler, nickel vessel, needle, etc. are the household objects which are attracted by a magnet.
Take a bar magnet. Bring the North Pole of the bar magnet close to the given magnet. Observe the part of the given magnet where attraction and repulsion take place.
The part of the given magnet that repels the bar magnet is its North Pole. Whereas, the part which attracts the bar magnet is the South Pole of the given magnet.
To determine the poles of a magnet take a bar magnet and tie a thread around its middle portion. Suspend it from a wooden stand so that it can rotate freely. After sometime you will find that the magnet sets itself in a definite direction and has become steady. One end of it will point towards the North and the other hand will point towards the South. Mark the end pointing towards the North as N and towards the South as S. This is the way used to determine the N and S poles of a magnet.
This can be done by freely suspending the bar magnet and the iron piece on two different wooden stands. Note that they should be free to rotate in the horizontal plane. Let the two become steady and come to rest. Observe which piece comes to rest in the North-South direction. Repeat this procedure 3-4 times and confirm it. The piece which comes to rest in the North-South direction is a magnet and the other is an iron piece.
We can confirm this observation using one more method. Take a known bar magnet. Take the North Pole of the known magnet near the ends of both the pieces one by one. One end of the two pieces will repel the known bar magnet. The piece which repels the known magnet is a magnet and the other is an iron piece.
We can move a magnet over the nails which are spread on the floor. Since, nails are made up of iron they easily get attracted towards the poles of the magnet and can be easily collected.