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Identify a good dielectric.

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in Electromagnetic Theory by (188k points)
Identify a good dielectric.

(a) Iron

(b) Ceramics

(c) Plastic

(d) Magnesium

I got this question in an interview.

My question is from Dielectrics in chapter Electric Fields in Material Space of Electromagnetic Theory

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The correct answer is (b) Ceramics

To explain I would say: Iron and magnesium are metals. Hence they need not be considered. Both ceramics and plastic are insulators. But dielectric constant is more for ceramics always. Hence ceramics is the best dielectric.

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