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(A) $1$. For paramagnetic materials, according to Curie's Law, $\chi = \frac{C}{T}$, which implies $\frac{1}{\chi} = \frac{T}{C}$. This represents a s

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$A$ is paramagnetic and $B$ is diamagnetic

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(A) $1$. For paramagnetic materials, according to Curie's Law, $\chi = \frac{C}{T}$, which implies $\frac{1}{\chi} = \frac{T}{C}$. This represents a straight line passing through the origin with a positive slope.$2$. For ferromagnetic materials above the Curie temperature $(T_c)$, the susceptibility follows the Curie-Weiss Law: $\chi = \frac{C}{T - T_c}$, which implies $\frac{1}{\chi} = \frac{T - T_c}{C}$. This represents a straight line with a positive slope that does not pass through the origin.$3$. For diamagnetic materials, the susceptibility $\chi$ is small, negative, and independent of temperature. Thus, $\frac{1}{\chi}$ is a constant negative value, resulting in a horizontal line (zero slope) in the $\frac{1}{\chi}$ vs $T$ graph.$4$. In the given figure, line $A$ passes through the origin with a positive slope, indicating it is paramagnetic. Line $B$ is a horizontal line (zero slope), indicating it is diamagnetic.$5$. Therefore, $A$ is paramagnetic and $B$ is diamagnetic.

For two types of magnetic materials $A$ and $B$, the variation of $\frac{1}{\chi}$ ($\chi$: magnetic susceptibility) versus temperature $T$ is shown in the figure. Then:

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