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The two square faces of a rectangular di...

The two square faces of a rectangular dielectric slab (dielectric constant 4.0) of dimensions 20cm x20cm x 1.0mm are metal -coated. Find the capacitance between the coated surfaces.

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` a = 20 cm xx 20 cm = 400 cm^(2)`
`= 4 xx 10^(-2) m , d = 1 m `
`= 1 xx 10^(-3) m , K = 4, t = d `
`C = eplison_0 KA / d `
= 8.74 xx 4 xx 4 xx 10^(-11) `
`= 141.6 xx 10^(-9) F = 1.42 n F` .
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