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The space between the plates of a parallel plate capacitor is filled with a ' dielectric ' whose dielectric constant varies with distance as for the relation : K(x)=K0+λx (λ)=a constant . The capacitance C , of this capacitor , would be related to its ' vacuum ' capacitance C0 as for the relation :

(a)C=λdln(1+K0λd)C0(b)C=λd.ln(1+K0λd)C0(c)C=λdln(1+λdK0)C0(d)C=λd.ln(1+K0λd)C0

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