निम्नलिखित में से कौन से कथन सत्य हैं? (i) सोना एक प्रतिचुंबकीय (diamagnetic) पदार्थ है। (ii) लौह-चुंबकीय (ferromagnetic) पदार्थ क्यूरी तापमान से ऊपर अनुचुंबकत्व (paramagnetism) के सभी गुण प्रदर्शित करते हैं। (iii) प्रतिचुंबकीय पदार्थ क्यूरी के नियम का पालन करते हैं। (iv) निर्वात की चुंबकीय प्रवृत्ति (magnetic susceptibility) शून्य होती है।

Which of the following statements is correct about ferromagnetic materials?

Which of the following statements is correct about anti-ferromagnetic materials?

Given below are two statements regarding a ferromagnetic material: Assertion (A): The individual atoms in a ferromagnetic material possess a magnetic dipole moment and interact with one another in such a way that they spontaneously align themselves forming domains. Reason (R): At high enough temperature, the domain structure of a ferromagnetic material disintegrates. Thus, magnetization will disappear at a high enough temperature known as the Curie temperature. In the light of the above statements, choose the correct answer from the options given below: