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**plez..I want your help :(**

I have HW is Difficult for me

if anybody can help me :(

Q1:

1)In a conducting media the wave equation:

[tex]\Delta[/tex]^2[tex]E[/tex]=[tex]\mu[/tex][tex]\sigma[/tex][tex]dE/dt[/tex]+[tex]\mu\epsilon[/tex][tex]d2E/dt2[/tex]

has solution of the type E(z, t) = E0 exp [ i (kZ –w t)], where

[tex]\kappa[/tex]^2 = [tex]\mu\epsilon[/tex] w2 + i [tex]\mu\sigma[/tex] w.

a) Find explicit expressions for real and imaginary parts of [tex]\kappa[/tex] .

b)Show that in a good conductor the electric field leads the magnetic field by 45(deg) and find the ratio of their amplitudes. ?

Q2:

A monochromatic plane polarized electromagnetic wave

E(r, t) = E0 sin (k. r – w t) is traveling eastward.

The wave is polarized with E directed vertically up and down alternately. Calculate E, B and the Poynting vector S provided that the amplitude of the electric field strength is 0.05 V/m and the frequency = 6 MHz. Also, find the <S>?

plez I want to the answer. befor friday night

thanx for all