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## Main Question or Discussion Point

A metal is not a good dielectric. A vacuum is a decent dielectric. There are much better dielectrics than a vacuum. A high dielectric constant, k, means the material exhibits good dielectric behaviour. A vacuum has k = 1, better dielectrics have k > 1.

What is the dielectric constant of metals? k = 0? K < 1 ?

Doesn't the dielectric constant of a material depend on the frequency of the EM waves pasing through it?

Where can I find an expression for the dielectric constant as a function of frequency?

I'm confused, please try to unconfuse me. thanks.

What is the dielectric constant of metals? k = 0? K < 1 ?

Doesn't the dielectric constant of a material depend on the frequency of the EM waves pasing through it?

Where can I find an expression for the dielectric constant as a function of frequency?

I'm confused, please try to unconfuse me. thanks.