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Which of the following statements about magnetic properties is/are incorrect?

(1) The magnetic field produced by unpaired electrons is due to their spin and orbital motion

(2) Paramangetism is when the inducted magnetic moment in the compound acts in the opposite direction of the applied field

(3) Ferromagnetism occurs mainly in metal alloys and oxides of transition elements

(4) Ferromagnetic substances show normal paramagnetic behaviour above a certain temperature called Neel Point

$\begin {array} {1 1} (1), (3) and (4) are\; incorrect \\ Only (2)\; is\; incorrect \\ Only (2)\; and\; (4)\; are\; incorrect \\ Only\; (3) \;and\; (4)\; are \;incorrect \end {array}$

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Answer: Only (2) and (4) are incorrect
(2) Paramangetism is when the inducted magnetic moment in the compound acts in the opposite direction of the applied field:
$\quad$ Diamagnetism is when a magnetic field is applied to a substance in which all electrons are paired and the inducted magnetic moment in the compound acts in the opposite direction.
(4) Ferromagnetic substances show normal paramagnetic behaviour above a certain temperature called Neel Point
$\quad$ For ferromagnetic substances, this is called Curie Point, and for anti-ferromagentic substances, its called Neel Point.
answered Jan 30, 2014 by sreemathi.v
edited Aug 6, 2014 by balaji.thirumalai
 

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