Class 12 Exam > Class 12 Questions > Find the true statement.a)Most of the substan...
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Find the true statement.
- a)Most of the substances show ferromagnetism
- b)The magnetic susceptibility of diamagnetic substances are temperature independent
- c)Water is paramagnetic in nature
- d)Typical domain size of a ferromagnetic material is 1 nm
Correct answer is option 'B'. Can you explain this answer?
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Find the true statement.a)Most of the substances show ferromagnetismb)...
The magnetic susceptibility of diamagnetic materials doesn’t depend upon temperature. This is often because there’s an outsized barrier between the bottom state and therefore the excited states of diamagnetic substances. Hence, it remains constant during the change of temperature. All the other statements are false.
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Find the true statement.a)Most of the substances show ferromagnetismb)...
Understanding Magnetic Susceptibility of Diamagnetic Substances
Diamagnetic substances are materials that exhibit a weak form of magnetism. When an external magnetic field is applied, they develop a very weak negative susceptibility, meaning they are slightly repelled by the magnetic field.
Key Point: Temperature Independence
- The magnetic susceptibility of diamagnetic substances is indeed temperature independent. This means that no matter the temperature, these materials will consistently show a weak repulsion from magnetic fields.
- In contrast, ferromagnetic and paramagnetic materials exhibit changes in their magnetic susceptibility with temperature. For example, paramagnetic substances become less magnetic at higher temperatures due to increased thermal agitation disrupting the alignment of magnetic moments.
Why Other Options Are Incorrect
- a) Most of the substances show ferromagnetism: This statement is false. Only a small number of materials, such as iron, cobalt, and nickel, exhibit ferromagnetism, while most substances are either diamagnetic or paramagnetic.
- c) Water is paramagnetic in nature: Water is actually considered to be weakly diamagnetic because it does not have unpaired electrons and does not show significant magnetic properties.
- d) Typical domain size of a ferromagnetic material is 1 nm: This is misleading. The domain sizes in ferromagnetic materials can vary widely and are typically much larger than 1 nm, often in the micrometer range.
In conclusion, option B is the correct answer as it accurately reflects the temperature-independent nature of diamagnetic susceptibility.
Diamagnetic substances are materials that exhibit a weak form of magnetism. When an external magnetic field is applied, they develop a very weak negative susceptibility, meaning they are slightly repelled by the magnetic field.
Key Point: Temperature Independence
- The magnetic susceptibility of diamagnetic substances is indeed temperature independent. This means that no matter the temperature, these materials will consistently show a weak repulsion from magnetic fields.
- In contrast, ferromagnetic and paramagnetic materials exhibit changes in their magnetic susceptibility with temperature. For example, paramagnetic substances become less magnetic at higher temperatures due to increased thermal agitation disrupting the alignment of magnetic moments.
Why Other Options Are Incorrect
- a) Most of the substances show ferromagnetism: This statement is false. Only a small number of materials, such as iron, cobalt, and nickel, exhibit ferromagnetism, while most substances are either diamagnetic or paramagnetic.
- c) Water is paramagnetic in nature: Water is actually considered to be weakly diamagnetic because it does not have unpaired electrons and does not show significant magnetic properties.
- d) Typical domain size of a ferromagnetic material is 1 nm: This is misleading. The domain sizes in ferromagnetic materials can vary widely and are typically much larger than 1 nm, often in the micrometer range.
In conclusion, option B is the correct answer as it accurately reflects the temperature-independent nature of diamagnetic susceptibility.
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Find the true statement.a)Most of the substances show ferromagnetismb)The magnetic susceptibility of diamagnetic substances are temperature independentc)Water is paramagnetic in natured)Typical domain size of a ferromagnetic material is 1 nmCorrect answer is option 'B'. Can you explain this answer?
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