Table of Contents
- 1 Does iron or steel have high retentivity?
- 2 Which of the following materials have higher retentivity of magnetism?
- 3 Why should permanent magnets have high retentivity?
- 4 What is high retentivity?
- 5 Is steel a permanent magnet?
- 6 How does retentivity affect the properties of a material?
- 7 What should the material used for permanent magnets have?
Does iron or steel have high retentivity?
Note: Retentivity of steel is more than the retentivity of soft iron. Soft iron is easily magnetized and demagnetized as compared to steel. The coercivity of soft iron is less than that of the coercivity of the steel.
Does steel have high retentivity?
Despite of steel having less retentivity as compared to soft iron core, it is still used for making permanent magnets. This is attributed to the fact that the coercivity of steel is way more than a soft iron core.
Which of the following materials have higher retentivity of magnetism?
Explanation: Alnico is having higher retentivity of magnetism.
Which metal has highest coercivity?
BR denotes retentivity and HC is the coercivity. The wider the outside loop is, the higher the coercivity….Experimental determination.
| Material | Coercivity (kA/m) |
|---|---|
| Iron filings (0.9995 wt) | 0.004–37.4 |
| Electrical steel (11Fe:Si) | 0.032–0.072 |
| Raw iron (1896) | 0.16 |
| Nickel (0.99 wt) | 0.056–23 |
Why should permanent magnets have high retentivity?
The materials for a permanent magnet should have high retentivity (so that the magnet is strong) and high coercivity (so that the magnetism is not wiped out by stray magnetic fields).
Which material is suitable for permanent magnet?
Permanent magnets are made from special alloys (ferromagnetic materials) such as iron, nickel and cobalt, several alloys of rare-earth metals and minerals such as lodestone.
What is high retentivity?
The retentivity of a material is its capacity to remain magnetized after the external magnetizing field has ceased to exist.A material with high retentivity (i.e. iron) will keep some magnetic properties, it will become a permanent magnet, whereas a material with low or no retentivity will not keep the magnetic …
Do electromagnets have high retentivity?
The retentivity of an electromagnet should be low so that after removing the electric current to the substance doesn’t get magnetized and return to its original state. Hence, the materials suitable for making electromagnets should have low retentivity and low coercivity.
Is steel a permanent magnet?
In its natural state, steel isn’t magnetic, but it can be modified in a way that turns it magnetic. Steel isn’t the only material used to make permanent magnets. Permanent magnets are also made of ceramic, iron, cobalt, nickel, gadolinium and neodymium.
Does permanent magnet have high coercivity?
Permanent magnets have high values of retentivity and coercivity.
How does retentivity affect the properties of a material?
The retentivity of a material is its capacity to remain magnetized after the external magnetizing field has ceased to exist.A material with high retentivity (i.e. iron) will keep some magnetic properties, it will become a permanent magnet, whereas a material with low or no retentivity will not keep the magnetic properties,
How is retentivity used in the magnetic field?
Retentivity is used for remanence measured in units of magnetic flux density. Materials which are required to retain their magnetism will have a fairly high retentivity and as such are used to make permanent magnets.
What should the material used for permanent magnets have?
The material used for permanent magnet should havea)high retantivity and low coercivityb)low retentivity and high coercivityc)low retentivity and low coercivityd)high retentivity and high coercivityCorrect answer is option ‘D’. Can you explain this answer? | EduRev JEE Question
What are materials with low coercivity used for?
Materials with low coercivity are said to be magnetically soft. They are used in transformer and inductor cores, recording heads, microwave devices, and magnetic shielding.