Magnetic permeability is maximum for

The magnetic susceptibility of a paramagnetic material is $1.0 \times 10^{-5}$ at $27^{\circ} C$ temperature. Then at what temperature its magnetic susceptibility would be $1.5 \times 10^{-5}$ (in $^{\circ} C$)?

Magnetic susceptibility of a paramagnetic substance is

The following graph shows the response of magnetization $M$ of a paramagnetic material to the applied magnetic field strength $H$ for three different temperatures $T_1$,$T_2$,and $T_3$. Which of the following is correct?

Which of the following statements is true in respect of diamagnetic substances?

Write the names of the materials used to make permanent magnets.