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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
Explain the following with suitable examples:
Antiferromagnetism
Pyrolusite ore is _______.
What is magnetic susceptibility?
Fe3O4 is ____________.
Assertion: On heating ferromagnetic or ferrimagnetic substances, they become paramagnetic.
Reason: The electrons change their spin on heating.
The value of magnetic moment is zero in the case of antiferromagnetic substances because the domains:
(i) get oriented in the direction of the applied magnetic field.
(ii) get oriented opposite to the direction of the applied magnetic field.
(iii) are oppositely oriented with respect to each other without the application of magnetic field.
(iv) cancel out each other’s magnetic moment.
Which one of the following pairs has only paramagnetic species?
Magnetic materials used for making permanent magnets (P) and magnets in a transformer (T) have different properties of the following, which property best matches for the type of magnet required ?
Which of the following is not paramagnetic?
The metal complex ion that is paramagnetic is ______.
(Atomic number of Fe = 26, Cu = 29, Co = 27 and Ni = 28)
