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The two square faces of a rectangular dielectric slab (dielectric constant 4.0) of dimensions 20cm x 20cm x 1.0mm are metal-coated.

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The two square faces of a rectangular dielectric slab (dielectric constant 4.0) of dimensions 20cm x 20cm x 1.0mm are metal-coated. Find the capacitance between the coated surfaces.

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A = 20cm × 20cm = 4 × 10–2m

d = 1m = 1 × 10–3m

k = 4 t = d

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