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प्रश्न
What type of substances would make better permanent magnets, ferromagnetic or ferrimagnetic. Justify your answer.
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उत्तर
Ferromagnetic substances would make better permanent magnets.
In solid state, the metal ions of ferromagnetic substances are grouped together into small regions. These regions are called domains and each domain acts as a tiny magnet. In an unmagnetised piece of a ferromagnetic substance, the domains are randomly oriented. As a result, the magnetic moments of the domains get cancelled. However, when the substance is placed in a magnetic field, all the domains get oriented in the direction of the magnetic field and a strong magnetic effect is produced.
The ordering of the domains persists even after the removal of the magnetic field. Thus, the ferromagnetic substance becomes a permanent magnet.
संबंधित प्रश्न
Define the following term:
Ferromagnetism
Write the type of magnetism observed when the magnetic moments are oppositely aligned and cancel out each other.
Explain the following with suitable examples:
Ferrimagnetism
The complexion [Ni(CN)4]2- is:
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.
Give the properties of dia/para/ferromagnetic materials.
What happens to the domains in a ferromagnetic material in the presence of external magnetic field?
Compare the properties of soft and hard ferromagnetic materials.
Assertion: On heating ferromagnetic or ferrimagnetic substances, they become paramagnetic.
Reason: The electrons change their spin on heating.
Which of the following statements is not true?
A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field becuase ______.
The heat of combustion of a substance is:
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 ?
The correct order of bond strength is ______.
Which of the following statements are correct?
- Electric monopoles do not exist whereas magnetic monopoles exist.
- Magnetic field lines due to a solenoid at its ends and outside cannot be completely straight and confined.
- Magnetic field lines are completely confined within a toroid.
- Magnetic field lines inside a bar magnet are not parallel.
- χ = -1 is the condition for a perfect diamagnetic material, where x is its magnetic susceptibility.
Among the following ions, which one has the highest paramagnetism?
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)
