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Which of the following is the correct expression for Piezoelectric effect?

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Which of the following is the correct expression for Piezoelectric effect?

(a) P = Zd + E

(b) P = Zd + εoE

(c) P = Zd + εoχE

(d) P = Zd + dεoχE

This question was posed to me in homework.

My question is from Piezoelectricity topic in section Dielectrics of Engineering Physics II

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Correct option is (c) P = Zd + εoχE

Explanation: The correct expression for the piezoelectric effect is: P = Zd + εoχE, where P is the polarization, Z is the stress, d is the piezoelectric strain constant, E the electric field and χ the electric susceptibility.

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