What is the difference between linear and non-linear dielectrics?

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A linear dielectric is defined as a material where the electric displacement field (D) is directly proportional to the electric field (E). In these materials, the electric dipolar moment per unit volume (P) shows a linear relationship with E. An example of a linear dielectric is glass, whereas barium titanate serves as an example of a non-linear dielectric. Understanding these distinctions is crucial for applications in electronics and materials science. The differences in behavior between linear and non-linear dielectrics significantly impact their usage in various technologies.
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can someone please tell me what a linear dielectric is, in words?

thanks
 
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One in which D is proportional to E.
 
In a linear dielectric the electric dipolar moment per unit volume (modulus of vector P) has a linear dependence on the electric field E
 
thanks for that! could you give me an example of a dielectric which is linear, and one which is not please?
 
Glass is mostly linear whilst barium titanate is highly non-linear
 
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