What are the permeability of the material, if the flux through a toroid changes from $0.65$ to $0.91$ $\mathrm{mWb}$ when the air core is replaced by another material.

Following plots show Magnetization $\left(M\right)$ vs Magnetising field $\left(H\right)$ and Magnetic susceptibility $\left(\mathrm{\chi }\right)$ vs Temperature $\left(T\right)$ graph :

Which of the following combination will be represented by a diamagnetic material?

Define magnetisation and magnetic intensity. Deduce the relation among relative magnetic permeability, permeability of vacuum and magnetic susceptibility. What is the values of susceptibility of a superconductor?

If ${\mathrm{\mu }}_{\mathrm{o}}$ and ${\mathrm{\epsilon }}_{\mathrm{o}}$ are respectively the permeability and permittivity of free space, $\mathrm{\mu }$ and $\mathrm{\epsilon }$ are the corresponding quantities in a medium, then the refractive index of the medium with respect to free space is:

State the relation between magnetic susceptibility $\left(\chi \right)$ and relative permeability$\left({\mu }_r\right)$ of a magnetic substance.

Of two metals A and B, it is found that ${\chi }_A>>1$ and  $-1\le {\chi }_B<0$. Name the types of materials to which the metals A and B do belong. Give one example of each.