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D6.1. Find the relative permittivity of the dielectric material present in a
parallel-plate capacitor if: (a) S = 0.12 m², d = 80 µm, Vo = 12 V, and the
capacitor contains 1 µJ of energy; (b) the stored energy density is 100 J/m,
Vo = 200 V, and d = 45 µm; (c) E = 200 kV/m and ps = 20 µC/m².
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Ans. 1.05; 1.14; 11.3

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