GATE EC 1994 Electromagnetics Solution Q 3

GATE EC 1994 Electromagnetics Solution Q 3

Copper behaves as a

(a) Conductor always

(b) conductor or dielectric depending on the applied electric field strength

(c) conductor or dielectric depending on the frequency

(d) conductor or dielectric depending on the electric current density

Ans : a)

Explanation

A material behave as conductor if,

\frac\sigma{\omega\in}>>1\;\;\;\;\;\;\;i.e.\;\;\;\;\;\;\sigma>>\omega\in

For copper, conductivity \sigma=5.8\times10^7mho/m

\in=8.856\;\times10^{-12}F/m

So, even at very large frequencies,

\sigma>>\omega\in

Hence copper is conductor at all frequencies.

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