Which of the following arrangements shows schematic alignment of magnetic moments of antiferromagnetic substances ?

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Solution

(d) The substances which have domain structure are oppositely oriented and cancel each other's magnetic fileld are known as antiferromagnetic substances.

Schematic arrangement of

antiferromagnetic substance

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\frac{1}{a} - \frac{1}{a b} + \frac{1}{a b c} - \frac{1}{a b c d} + \dots = \frac{1}{a +} \frac{a}{b - 1 +} \frac{b}{c - 1 +} \frac{c}{d - 1 +} \dots

A (0, 1, 0), B (0, 1, 1),

C (1, 0, 1)

D (1, 1, 1)

∣ ∣ ∣ ∣ ∣ ∣ \begin{matrix} 1 + a & 1 & 1 & 1 1 & 1 + b & 1 & 1 1 & 1 & 1 + c & 1 1 & 1 & 1 & 1 + d \end{matrix} ∣ ∣ ∣ ∣ ∣ ∣

a b c = 1

\frac{1}{1 + a + b^{- 1}} + \frac{1}{1 + b + c^{- 1}} + \frac{1}{1 + c + a^{- 1}} = 1

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