A parallel plate capacitor has its length, width and separation doubled. It fringing effects are neglected, to keep the capacitance same, the dielectric constant must be

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. When dimensions are changed, A become four times and d becomes twice.

Since ∈₀ is constant, ∈_r must be halved to keep C constant.

A parallel plate capacitor has its length, width and separation doubled. It fringing effects are neglected, to keep the capacitance same, the dielectric constant must be

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