How can there be negative capacitance?

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Golnaz Karbasian

Hi, Can you rephrase your question?

H. Tomasz Grzybowski

If I put positive charge on an electrode, then negative permittivity means that there will be positive charge on the surface of the dielectric near the electrode. If this happens, it must be a dynamic phenomenon. At what frequencies is permittivity negative? Are there frequencies at which permitivity is zero?

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