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Which of the following materials exhibit Ferro-electricity?

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in Engineering Physics II by (679k points)
Which of the following materials exhibit Ferro-electricity?

(a) Iron

(b) Platinum

(c) Hydrogen

(d) Rochelle salt

This question was posed to me in homework.

This is a very interesting question from Properties of Dielectric Materials topic in chapter Dielectrics of Engineering Physics II

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Best answer
The correct option is (d) Rochelle salt

The best explanation: When a dielectric exhibits electric polarisation even in the absence of an external field, it is known as ferro-elecricity and these materials are termed as Ferro-electrics. They are anisotropic crystals that exhibit spontaneous polarisation. Hence only Rochelle salt exhibits Ferro-electricity.

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