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प्रश्न
Compare the properties of soft and hard ferromagnetic materials.
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उत्तर
| Properties | Soft ferromagnetic materials | Hard ferromagnetic materials |
| 1. Absence of external field. | Magnetisation disappear | Magnetisation remains |
| 2. Area of the loop | Small | Large |
| 3. Retentivity | Low | High |
| 4. Coercivity | Low | High |
| 5. Susceptibility and magnetic permeability | High | Low |
| 6. Hysteresis loss | Less | More |
| 7. Uses | Solenoid core, transformer core, and electromagnets | Permanent magnet |
| 8. Examples | Soft iron, Mumetal, Stelloy, etc. | Steel, Alnico, Lodestone, etc. |
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संबंधित प्रश्न
Write the type of magnetism observed when the magnetic moments are aligned in parallel and anti-parallel directions in unequal numbers.
Explain the following with suitable examples:
Paramagnetism
Explain why:
(i) Transition elements form coloured compounds.
(ii) Interhalogen compounds are more reactive than their constituent elements.
(iii) Cu+ is diamagnetic but Cu2+ is paramagnetic. (Z = 29)
Out of [CoF6]3- and [Co(en)3]3+, which one complex is
(i) paramagnetic
(ii) more stable
(iii) inner orbital complex and
(iv) high spin complex
(Atomic no. of Co = 27)
Compare dia, para and ferromagnetism.
When heated to high temperature, ferromagnetic substance changes to ____________.
Which type of substances would make better permanent magnets?
Which of the following arrangements shows schematic alignment of magnetic moments of antiferromagnetic substances?
A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field becuase ______.
Which of the following statements are correct?
(i) Ferrimagnetic substances lose ferrimagnetism on heating and become paramagnetic.
(ii) Ferrimagnetic substances do not lose ferrimagnetism on heating and remain ferrimagnetic.
(iii) Antiferromagnetic substances have domain structures similar to ferromagnetic substances and their magnetic moments are not cancelled by each other.
(iv) In ferromagnetic substances all the domains get oriented in the direction of magnetic field and remain as such even after removing magnetic field.
