Question

write short note on attaction and repulsion of magnet​

Answer 1

Answer:A magnet's most notable and well known property is its ability to attract and repel both ferromagnetic materials and other magnets.  

Attract: To be pulled together by magnetic forces.

Repel: To be pushed away by magnetic forces.

• It is very fun to play with magnets to see whether they will attract or repel each other. One way to do this is to try and figure out which ends tend to meet when two magnets are held close together.  The pole of a magnet is the place where the magnetic force is the strongest.  A bar magnet has a pole at each end, one a north-seeking pole and the other a south-seeking pole. Often times magnets will have these north and south poles marked, making it very easy to distinguish which ends will attract and which ends will repel each other.  

• By playing with magnets, you will soon discover that unlike poles attract each other while identical poles repel each other.  By putting two magnets with both north poles facing each other, you will feel the force of repulsion pushing the two magnets apart. On the other hand, if you place the south pole of one magnet beside the north pole of another magnet, you will feel the force of attraction pulling them together.  

• No matter how small a magnet is, it will always have north and south poles. If you cut a magnet in half, two new magnets, both with north and south poles, will be formed.

• The Earth has two poles very much like a magnet's poles.  It has both a north and south pole.  A compass is able to function because of this attribute of the Earth.  Because a compass needle is a magnet, one end points to the Earth's magnetic north pole while the other points to the Earth's magnetic south pole.  A compass is useful because it can help travelers determine direction.

• The main things you need to know about attraction and repulsion are:

- Opposite poles will attract each other and will stick together.

-Alike poles will repel each other and will be forced apart.

Hope this helps you :)

Answer 2

Answer:

If you want to knw more read explanation

One end of a magnet is called the south-seeking pole and the other north-seeking. ... When two opposite magnetic poles are close, they attract each other. When like poles are pushed together, there is a force of repulsion. The rule for magnets is that like poles repel and unlike poles attract.

Explanation:

Magnetic Poles, Forces, and Fields

Any object that exhibits magnetic properties is called a magnet. Every magnet has two points, or poles, where most of its strength is concentrated; these are designated as a north-seeking pole, or north pole, and a south-seeking pole, or south pole, because a suspended magnet tends to orient itself along a north-south line. Since a magnet has two poles, it is sometimes called a magnetic dipole, being analogous to an electric dipole, composed of two opposite charges. The like poles of different magnets repel each other, and the unlike poles attract each other.

One remarkable property of magnets is that whenever a magnet is broken, a north pole will appear at one of the broken faces and a south pole at the other, such that each piece has its own north and south poles. It is impossible to isolate a single magnetic pole, regardless of how many times a magnet is broken or how small the fragments become. (The theoretical question as to the possible existence in any state of a single magnetic pole, called a monopole, is still considered open by physicists; experiments to date have failed to detect one.)

From his study of magnetism, C. A. Coulomb in the 18th cent. found that the magnetic forces between two poles followed an inverse-square law of the same form as that describing the forces between electric charges. The law states that the force of attraction or repulsion between two magnetic poles is directly proportional to the product of the strengths of the poles and inversely proportional to the square of the distance between them.

As with electric charges, the effect of this magnetic force acting at a distance is expressed in terms of a field

of force. A magnetic pole sets up a field in the space around it that exerts a force on magnetic materials. The field can be visualized in terms of lines of induction (similar to the lines of force of an electric field). These imaginary lines indicate the direction of the field in a given region. By convention they originate at the north pole of a magnet and form loops that end at the south pole either of the same magnet or of some other nearby magnet (see also flux, magnetic

). The lines are spaced so that the number per unit area is proportional to the field strength in a given area. Thus, the lines converge near the poles, where the field is strong, and spread out as their distance from the poles increases.

A picture of these lines of induction can be made by sprinkling iron filings on a piece of paper placed over a magnet. The individual pieces of iron become magnetized by entering a magnetic field, i.e., they act like tiny magnets, lining themselves up along the lines of induction. By using variously shaped magnets and various combinations of more than one magnet, representations of the field in these different situations can be obtained.

Magnetic Materials

The term magnetism is derived from Magnesia, the name of a region in Asia Minor where lodestone, a naturally magnetic iron ore, was found in ancient times. Iron is not the only material that is easily magnetized when placed in a magnetic field; others include nickel and cobalt. Carbon steel was long the material commonly used for permanent magnets, but more recently other materials have been developed that are much more efficient as permanent magnets, including certain ferroceramics and Alnico, an alloy containing iron, aluminum, nickel, cobalt, and copper.

Materials that respond strongly to a magnetic field are called ferromagnetic [Lat. ferrum = iron]. The ability of a material to be magnetized or to strengthen the magnetic field in its vicinity is expressed by its magnetic permeability. Ferromagnetic materials have permeabilities of as much as 1,000 or more times that of free space (a vacuum). A number of materials are very weakly attracted by a magnetic field, having permeabilities slightly greater than that of free space; these materials are called paramagnetic. A few materials, such as bismuth and antimony, are repelled by a magnetic field, having permeabilities less than that of free space; these materials are called diamagnetic.

.