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The piezoelectric strain can be shown as ___________

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The piezoelectric strain can be shown as ___________

(a) deik/dZ

(b) deik/dχ

(c) deik/dEi

(d) deik/dε

I had been asked this question in an interview for internship.

The question is from Piezoelectricity in section Dielectrics of Engineering Physics II

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Right answer is (c) deik/dEi

For explanation: In practice, the tensile or compressional or shear strains develop in different direction due to an applied electric field depending on the crystal orientation and field direction. The expression for strain is: deik/dE.

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