exercise 1.2

c0=299792458    % [m/s] light velocity in vacuum
etha0=120*pi

er=2.54    % polystyrene relative permittivity
E0=5        % [V/m] electric field amplitude 
f0=2.4e9   % [Hz]

x1=.1        % [m]
x2=.15      % [m]

%% a) amplitude and direction of magnetic field

% Electric field

lambda0=c0/f0

k0=2*pi/lambda0

% Ey=E0*cos(2*pi*f0*t-k0*x)

etha=etha0/er^.5

H0=E0/etha


%% b) phase and velocity

vp=c0/er^.5

%% c) wavelength

lambda=vp/f0


%% d) phase shift bnetween x1=.1m and x2=.15m

dphi=k0*(x2-x1)