In a material for which o=5.0 S/m and e, =1 the electric field intensity is E- 250 sin 10" (V/m). Find the conduction and displacement current densities, and the frequency at they have equal magnitudes.

Explanation:

Given that:

The conductivity of the material = 5.0 s/m

; &

The electric field intensity of the material E = 250 sin(10¹⁰ t) V/m

(a) The conduction current density

(b)  Displacement  current density

Recall that:

∴

(c) The frequency at which will have the same magnitude is:

By substitution

f = 90 GHz