Magnetization and Magnetic Intensity

If the magnetic flux is expressed in weber, then the magnetic induction can be expressed in 

For superconductors, magnetic susceptibility is -

Cotyledons are also called-

The magnetic susceptibility of a paramagnetic substance at $-173 \mathrm{℃}$ is $1.5\times {10}^{-2}$, then it's value at $-73 \mathrm{℃}$ will be:

The relation connecting magnetic susceptibility $X_m$ and relative permeability ${\mu }_r$ is

A domain in ferromagnetic iron in the form of cube is having $5\times {10}^5$ atoms. If the side length of this domain is $1.5 \mathrm{\mu m}$ and each atom has a dipole moment of $8\times {10}^{-24} \mathrm{A} {\mathrm{m}}^2$, then magnetisation of domain is 

The magnetic field $\left(B\right)$ inside a long solenoid having ${n }^{}$turns per unit length and carrying current $I$ when iron core is kept in it is ( ${\mu }_0$ = permeability of vacuum, $\chi$ = magnetic susceptibility)

The susceptibility of a magnet at $300 \mathrm{K}$ is $1.2\times {10}^{-5}$ . The temperature at which the susceptibility increases to $1.8\times {10}^{-5}$ is

Susceptibility is positive and large for a

Which of the following relation is not correct?