The indices of refraction of fused silica and a soda???lime glass within the visible spectrum are 1.458 and 1.51, respectively. For each of these materials determine the fraction of the relative dielectric constant at 60 Hz that is due to electronic polarization, using the data of Table 18.5. Neglect any orientation polarizationeffects.

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Dielectric Constant Dielectric Strength (V/mil)" 1 MHz Material 60 Hz Ceramics Titanate ceramics 15-10,000 50-300 Mica Steatite (MgO-SiO,) Soda-lime glass Porcelain Fused silica 5.4-8.7 5.5-7.5 1000-2000 200-350 250 6.9 6.0 3.8 6.9 6,0 4.0 40-400 250 Polymers Phenol-formaldehyde Nylon 6,6 Polystyrene Polyethylene Polytetrafluoroethylene 5.3 4.8 300-400 3.6 4.0 400 2.6 2.6 2.3 500-700 2.3 450-500 2.1 2.1 400-500 |।।३३