Fill in the blanks :-
1. _________________________is the surest test of magnetism.
2. A material which attracts pieces of iron or steel is called ____________________.
3. _______________________ is the world‟s first magnet.
4. Electronics devices get damaged by _________________________.
5. The substances which are strongly attracted by a magnet are called ______________ substances.
6. The two main important properties of a magnet are its____ property and its _______ property.
Write True of False :-
1. Mixture of ferric oxide & barium oxide is called ferrite.
2. A freely floating magnet always points in North – South direction.
3. Aluminium is an example for magnetic substances.
4. Pieces of iron keeping on both ends of magnet are called magnetic keepers.
5. Magnetic attraction is maximum at the poles of a magnet.
Answers
Explanation:
Magnets do the following things:
Attract certain materials, such as iron, nickel, cobalt, certain steels and other alloys.Exert an attractive or repulsive force on other magnets (opposite poles attract, like poles repel).Have an effect on electrical conductors when the magnet and conductor are moving in relation to each other.Have an effect on the path taken by electrically charged particles traveling in free space.
Based on these effects, magnets transform energy from one form to another, without any permanent loss of their own energy. Examples of magnet functions are:
Mechanical to mechanical, such as attraction and repulsion.Mechanical to electrical, such as generators and microphones.Electrical to mechanical, such as motors, loudspeakers, charged particle deflection.Mechanical to heat, such as eddy current and hysteresis torque devices.Special effects, such as magneto-resistance, Hall effect devices, and magnetic resonance. (top)How are magnets made?
Modern magnet materials are made through casting, pressing and sintering, compression bonding, injection molding, extruding, or calendaring processes. Once manufactured, magnets often need to be further processed by grinding or other machining processes, and then assembled into a next level assembly. Visit our manufacturing and assembly page to learn more about our custom machining and assembly capabilities. (top)
Are there different types of magnets available?
There are three types of magnets: permanent magnets, temporary magnets, and electromagnets.
Permanent magnets emit a magnetic field without the need for any external source of magnetism or electrical power.Temporary magnets behave as magnets while attached to or close to something that emits a magnetic field, but lose this characteristic when the source of the magnetic field is removed.Electro-magnets require electricity in order to behave as a magnet. (top)
There are many different types of permanent magnet materials, each with their own unique characteristics. Each material has a family of grades that have properties slightly different from each other, though based on the same composition. (top)
What are permanent magnets made of?
Modern permanent magnets are made of special alloys that have been found through research to create increasingly better magnets. The most common families of permanent magnet materials today are made out of aluminum-nickel-cobalt (alnicos), strontium-iron (ferrites, also known as ceramics), neodymium-iron-boron (a.k.a. neodymium magnets, or "super magnets"), and samarium-cobalt. (The samarium-cobalt and neodymium-iron-boron families are collectively known as the rare-earths). (top)