Which of the following statements is not true?
A. Paramagnetic substances are weakly attracted by magnetic field.
B. Ferromagnetic substances cannot be magnetized 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.
Every element has some magnetic property due to the property of the electrons present. On the basis of their magnetic properties, substances can be classified as paramagnetic, diamagnetic, ferromagnetic, antiferromagnetic and ferrimagnetic.
Paramagnetic substances are weakly attracted by magnetic field and are magnetized in a magnetic field in the same direction. Option (i) is a true statement.
Ferromagnetic substances are those substances which are strongly attracted to a magnetic field and can be magnetized permanently. The domains of the substance when placed in a magnetic field all get oriented in one direction, that is, the direction of the magnetic field and persist even when the field is removed. Thus option (ii) is not true.
Antiferromagnetic substances show the presence of domains like ferromagnetic substances but they are all oppositely oriented and cancel out each other’s magnetic moment. Option (iii) is correct.
Diamagnetic substances are those which are weakly repelled by a magnetic field. This happens because all the electrons in these substances are paired and no electron is unpaired. Pairing out electrons cancels the magnetic moment. Option (iv) is correct.
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