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प्रश्न
Compare dia, para and ferromagnetism.
How is ferromagnetism different from paramagnetism?
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उत्तर
| Diamagnetism | Paramagnetism | Ferromagnetism | |
| 1. | A force tends to move the material from the stronger part to the weaker part of the external field. | Weak magnetism in the direction of the applied field. | Strong magnetism in the direction of the applied field. |
| 2. | Each electron has finite orbital magnetic dipole moments. | Each atom has a net magnetic dipole moment. | Have a net dipole moment as in a paramagnetic material. |
| 3. | Since the orbital planes are orientated in a random manner, the vector sum of magnetic moments is zero. | Due to the random orientation of the magnetic moments, the net magnetic moment of the material is zero. | Within each domain, the magnetic moments are spontaneously aligned in a direction. |
| 4. | The resultant magnetic moment for each atom is zero. | There is a net magnetic dipole moment induced in the direction of the applied field. | Since the direction of magnetisation varies from domain to domain, the net magnetisation of the specimen is zero. |
| 5. | E.g.: Bismuth, copper, water, etc. | E.g.: Aluminium, platinum, oxygen, etc. | E.g.: Iron, cobalt, nickel, etc. |
Notes
Students should refer to the answer according to their questions.
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संबंधित प्रश्न
Iron (z=26) is highly ferromagnetic. Explain.
Write the type of magnetism observed when the magnetic moments are oppositely aligned and cancel out each other.
Write the type of magnetism observed when the magnetic moments are aligned in parallel and anti-parallel directions in unequal numbers.
What type of substances would make better permanent magnets, ferromagnetic or ferrimagnetic. Justify your answer.
Explain the following with suitable examples:
Ferrimagnetism
Give reasons:Ferrimagnetic substances show better magnetism than antiferromagnetic substances.
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)
The BH curve for a ferromagnetic material is shown in the figure. The material is placed inside a long solenoid which contains 1000 turns/cm. The current that should be passed in the solenonid to demagnetize the ferromagnet completely is
What is magnetic susceptibility?
All those atoms or molecules which have an odd number of electrons are
Which type of substances would make better permanent magnets?
A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field becuase ______.
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 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.
Which one of the following would feel attraction when placed in magnetic field: Co2+, Ag+, Ti4+, Zn2+
Some of the polar crystals when heated produces small electrical current. This phenomenon is called ______.
The susceptibility of a paramagnetic material is 99. The permeability of the material in Wb/A-m is ______.
[permeability of the free space μ0 = 4π × 10-7 Wb/A - m]
Match items of List - I with those of List - II:
| List - I | List - II | ||
| (Property) | (Example) | ||
| (A) | Diamagnetism | (i) | MnO |
| (B) | Ferrimagnetism | (ii) | O2 |
| (C) | Paramagnetism | (iii) | NaCl |
| (D) | Antiferromagnetism | (iv) | Fe3O4 |
Choose the most appropriate answer from the options given below:
Give a reason for the following:
Cu+2 salts are paramagnetic, while Cu+ salts are diamagnetic.
