Types of Magnetic Material
Types of Magnetic Material
Magnets are made of materials that attract objects made of certain substances like iron, cobalt, and nickel. The substances that are attracted by the magnet are called magnetic substances. For example, iron, steel, nickel and cobalt All types of materials and substances posses some kind of magnetic properties., but normally ferromagnetic materials are called magnetic materials. The materials can be classified into following categories based on the magnetic properties shown by them: The substances that are not attracted by the magnet are called non-magnetic substances. For example, wood, stone, leather, plastic,aluminium and copper.
1. Diamagnetic Materials:
These materials are barely magnetized when placed in a magnetic field. Magnetic dipoles in these substances tend to align in opposition to the applied field. In effect, they produce an internal magnetic field that opposes the applied field and the substance tends to repel the external field around it.
This opposing field disappears as soon as the external field is removed.
Ex: Gold, water, mercury and even animals!
2. Paramagnetic Materials:
In these materials the magnetic dipoles in the Magnetic Materials tend to align along the applied magnetic field and thus reinforcing the applied magnetic field. Such substances are attracted by a magnet if it applies a sufficiently strong field. It must be noted that such materials are still feeble magnetized and the magnetization disappears as soon as the external field is removed. Ex: Liquid oxygen, sodium, platinum, salts of iron and nickel.
3. Ferromagnetic Materials
We are most familiar with these materials as they exhibit the strongest magnetic behaviour. Magnetic dipoles in these materials are arranged into domains where the arrangements of individual magnetic dipoles are essentially perfect that can produce strong magnetic fields. Normally, these domains are usually randomly arranged and thus the magnetic field of each domain is cancelled by another and the entire material does not show any magnetic behaviour.
However when an external field is applied, the domains reorient themselves to reinforce the external field and produce a strong internal magnetic field that is along the external field. Upon, removal of the external field, most of the domains stay put and continues to be aligned in the direction of the (erstwhile) magnetic field. Thus, the magnetic field of the Magnetic Materials persists even when the external field disappears. This property is used to produce permanent magnets that we use every day. Iron, cobalt, nickel, neodymium and their alloys are usually highly ferromagnetic and are used to make permanent magnets.
Magnetite is a _______________________ | |||
| Right Option : A | |||
| View Explanation | |||
Which of the following are correct : (a) The substances that are not attracted by the magnet are called magnetic substances. (b) Diamagnetic Materials are barely magnetized when placed in a magnetic field. | |||
| Right Option : B | |||
| View Explanation | |||
The substances that are not attracted by the magnet are called __________________ substances. | |||
| Right Option : A | |||
| View Explanation | |||
Students / Parents Reviews [20]
Abhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
Om Umang
10thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Manish Kumar
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Ayan Ghosh
8thMy experience with Abhyas academy is very nice or it can be said wonderful. I have been studying here from seven class. I have been completing my journey of three years. I am tinking that I should join Abhyas Academy in tenth class as I am seeing much improvement in Maths and English
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Cheshta
10thAbhyas institute is one of the best coaching institute in the vicinity of Ambala cantt.The institute provides good and quality education to the students.The teachers are well experienced and are very helpful in solving the problems. The major advantages of the institute is extra classes for weak...
Shreya Shrivastava
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8thIn terms of methodology I want to say that institute provides expert guidence and results oriented monitering supplements by requsite study material along with regular tests which help the students to improve their education skills.The techniques of providing education helps the students to asses...
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