Which of the following is not a dielectric material ?

1.	Which of the following is not a dielectric material ?
A.	Cotton, silk and paper.
B.	Asbestos, glass, porcelain and mica.
C.	Rubber and polymeric resins.
D.	All refractory materials.
Answer» D. All refractory materials.

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Which of the following is not a dielectric material ?

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