Question

Which law states that magnetic susceptibility is inversely proportional to absolute temperature?

• A. Ohm's Law
• B. Curie's Law
• C. Faraday's Law
• D. Gauss's Law

Hint:

For paramagnetic substances: \[ \chi = \frac{C}{T} \] This means susceptibility decreases as temperature increases.

Answer 1

The Correct Option is B

Concept: Magnetic susceptibility (\(\chi\)) is a measure of how much a material becomes magnetized in the presence of an external magnetic field. For paramagnetic materials, the susceptibility depends on temperature.

Step 1: Statement of Curie's Law. Curie's Law states that the magnetic susceptibility of a paramagnetic substance is inversely proportional to its absolute temperature. \[ \chi \propto \frac{1}{T} \] or \[ \chi = \frac{C}{T} \] where \(C\) is Curie's constant and \(T\) is the absolute temperature.

Step 2: Interpretation of the law.
• As temperature increases, thermal agitation increases.
• This reduces the alignment of magnetic dipoles.
• Hence, magnetic susceptibility decreases.

Step 3: Conclusion. Therefore, the law stating that magnetic susceptibility is inversely proportional to absolute temperature is Curie's Law.