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

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Solution

Answer: (b) Ferromagnetic substances cannot be magnetised permanently

Ferromagnetic substances can be magnetised by applying the magnetic field to it and magnetic property persists within it even after removal of the magnetic field.

Hence, choice (b) is the correct answer while the other three choices are correct statements.

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Similar questions

Which of the following statements are correct ?

(a) Ferrimagnetic substances lose ferrimagnetism on heating and become paramagnetic

(b) Ferrimagnetic substances do not lose ferrimagnetism on heating and remain ferrimagnetic

(c) Antiferromagnetic substances have domain structures similar to ferromagnetic substances and their magnetic moments are not cancelled by each other

(d) In ferromagnetic substances, all the domains get oriented in the direction of magnetic filed and remain as such even after removing magnetic field

The value of magnetic moment is zero in the case of antiferromagnetic substances because the domains ...........

(a) get oriented in the direction of the applied magnetic fiels

(b) get oriented opposite to the direction of the applied magnetic fiels

(d) cancel out each other's magnetic moment

The substances which contain species with unpaired electrons in their orbitals behave as paramagnetic substances. Such substances are weakly attracted by the magnetic field. The paramagnetism is expressed in terms of magnetic moment. The magnetic moment is related to the number of unpaired electrons according to the following relation:
Magnetic moment,