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
(A) Cotton, silk and paper
(B) Asbestos, glass, porcelain and mica
(C) Rubber and polymeric resins
(D) All refractory materials