Class 12 Physics Magnetism and Matter Magnetic Materials (Diamagnetic, Paramagnetic and Ferromagnetic)

Easy

Which of the following is desirable for making permanent magnets?

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A
Low coercive field and low retentivity
B
Low coercive field and high retentivity
C
High coercive field and high retentivity
D
High coercive field and low retentivity

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Class 12 Questions

Class 12

Physics Questions

Chapter

Magnetism and Matter

Subtopic

Magnetic Materials (Diamagnetic, Paramagnetic and Ferromagnetic)

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The Curie temperatures of cobalt and iron are $1400 \,K$ and $1000 \,K$ respectively. At $T=1600 \,K$, the ratio of the magnetic susceptibility of cobalt to that of iron is

For a paramagnetic substance, the magnetic susceptibility is

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Which of the following figures best represents the variation of magnetic susceptibility $(\chi)$ with temperature for a diamagnetic substance?

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Identify the paramagnetic substance.

Easy

There are $2.0 \times 10^{24}$ molecular dipoles in a paramagnetic salt. Each has a dipole moment of $1.5 \times 10^{-23} \text{ A m}^2$. Find the maximum (saturation) magnetization in the specimen. (in $\text{ A m}^2$)

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