field E is p \times E. 5.5. For an applied electric field $E = 0.1 \cos 2\pi \times 10^9 t \mathbf{a}_x$ V/m, find the polarization current crossing an area of 1 cm$^2$ normal to the field for the following materials: (a) polystyrene, (b) mica, and (c) distilled water.
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