Magnetic Properties of Matter — Prelims Questions

Which of the following statements is INCORRECT regarding the magnetic properties of materials?

A paramagnetic material has a magnetic susceptibility of $3 \times 10^{-4}$ at $27^\circ\text{C}$. What will be its susceptibility at $127^\circ\text{C}$?

Which of the following materials would be most suitable for making the core of a transformer?

If the magnetic susceptibility of a material is $-0.000025$, what type of material is it likely to be?

Which of the following is an example of a diamagnetic substance?

A material is placed in an external magnetic field. The magnetic field lines inside the material become denser than in the surrounding region. This material could be: