Consider the following statements: I. Diamagnetism arises from an induced magnetic moment opposite to the applied field. II. Paramagnetic atoms generally possess permanent magnetic moments, but thermal agitation tends to randomise them. III. Ferromagnetism involves cooperative alignment associated with exchange interaction and magnetic domains. IV. Above the Curie temperature, a ferromagnet generally loses spontaneous ferromagnetic ordering. Which option is correct?
Options

Question

Consider the following statements: I. Diamagnetism arises from an induced magnetic moment opposite to the applied field. II. Paramagnetic atoms generally possess permanent magnetic moments, but thermal agitation tends to randomise them. III. Ferromagnetism involves cooperative alignment associated with exchange interaction and magnetic domains. IV. Above the Curie temperature, a ferromagnet generally loses spontaneous ferromagnetic ordering. Which option is correct?

Options

G1 Physics · Accepted Answer

Statement I is correct: diamagnetism is an induced response opposing the applied field. Statement II is correct: paramagnetic particles possess permanent moments, while thermal agitation opposes their alignment. Statement III is correct: exchange interaction produces cooperative alignment and domain formation in ferromagnets. Statement IV is correct: above T_C, thermal agitation destroys long-range spontaneous ferromagnetic order and the material generally behaves paramagnetically. Therefore al…