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Introduction to Imperfections in Solids

i Write the t...

Question

(i) Write the type of magnetism observed when the magnetic moments are aligned in parallel and anti-parallel directions in unequal numbers.

(ii) Which stoichiometric defect decreases the density of the crystal ?

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Solution

(i) Ferrimagnetism

(ii) Schottky defect

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Q. (i) Write the type of magnetism observed when the magnetic moment are aligned in parallel and anti-parallel directions in unequal numbers?
(ii) Which stoichiometric defect decreases the density of the crystal?

Q. (i) Write the type of magnetism observed when the magnetic moments are oppositely aligned and cancel out each other.

(ii) Which stoichiometric defect does not change the density of the crystal?

Q. (i) Write the type of magnetism observed when the magnetic moment are oppositely aligned and cancel out each other?
(ii) Which stoichiometric defect does not change the density of the crystal?

Q. Assertion :Substances like

F e_{3} O_{4}

M g F e_{2} O_{4}

lose ferrimagnetism on heating and become paramagnetic. Reason: Magnetic moments of the domains in these substances are aligned in parallel and antiparallel directions in unequal numbers.

Q. A bar magnet has a magnetic moment

2.5 J T^{- 1}

and is placed in a magnetic field of

0.2 T

. Work done in turning the magnet from parallel to anti-parallel position relative to the field direction.

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