Step 1: Understanding the Question:
The question asks to identify the specific law that describes the relationship between the temperature of a material and its magnetic susceptibility (\(\chi\)).
Step 2: Key Formula or Approach:
For paramagnetic materials, as thermal agitation increases (temperature rises), the alignment of atomic dipoles becomes more difficult, reducing susceptibility.
Step 3: Detailed Explanation:
1. Pierre Curie discovered that for many paramagnetic materials, the susceptibility is not constant.
2. The mathematical relation is expressed as:
\[ \chi \propto \frac{1}{T} \implies \chi = \frac{C}{T} \]
Where \(T\) is the absolute temperature (in Kelvin) and \(C\) is the Curie constant.
3. Faraday's Law relates to EM induction, Lenz's Law to the direction of induced current, and Gauss's Law to electric/magnetic flux. Therefore, Curie's Law is the correct choice.
Step 4: Final Answer:
The law is Curie's Law (B).