question_answer 80)

  Which of the following statements is not true? (a) Paramagnetic substances are weakly attracted by magnetic field (b) Ferromagnetic substances cannot be magnetised permanently (c) The domains in antiferromagnetic substances are oppositely oriented with respect to each other (d) Pairing of electrons cancels their magnetic moment in the diamagnetic substances 

Answer:

                  (b) Ferromagnetic substances can be magnetised by applying magnetic field to it and magnetic property persist within it even after removal of magnetic field. Hence, choice (b) is the correct answer while other three choices are correct.