A paramagnetic sample showing a net magnetisation of 0.8 Am^-1, when placed in an external magnetic field of strength 0.8 T, at a temperature 5 K. If the temperature is raised to 20 K, then the magne…

Question

A paramagnetic sample showing a net magnetisation of 0.8 Am^-1, when placed in an external magnetic field of strength 0.8 T, at a temperature 5 K. If the temperature is raised to 20 K, then the magnetisation becomes

Accepted Answer

Correct answer: B. (b) Since, M= CBT, where M= magnetisation where, C is Curie's temperature. ⇒m ∝ 1T ∴ m_1m_2= T_2T_1 ⇒m_2= m_1T_1T_2 = 0.8 520=0.2 Am^-1

$A paramagnetic sample showing a net magnetisation of 0.8 Am^{- 1}, when placed in an external magnetic field of strength 0.8 T, at a temperature 5 K . If the temperature is raised to 20 K, then the magnetisation becomes$

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