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+// Exa 2.9

+clc;

+clear;

+close;

+// given :

+epsilon_0=8.854*10^(-12) // permittivity in free space

+sigma_1=0 //conductivity of medium 1

+sigma_2=0 // conductivity of medium 2

+epsilon_r1=1 // region 1 relative permittivity

+epsilon_r2=2 // region 2 relative permittivity

+epsilon_1=epsilon_r1*epsilon_0 // region 1 permittivity

+epsilon_2=epsilon_r2*epsilon_0 // region 2 permittivity

+E1=[1 2 3] // Electric field in region 1 in V/m

+Et1=[0 2 3] // tangential component of electric field E1

+En1=[1 0 0] // normal component of electric field E1

+Et2=[0 2 3] // as tangential componenet of electric field E2=tangential component of electric field E1

+En2=(epsilon_1/epsilon_2)*En1 // normal component of electric field E2

+E2=Et2+En2 // electric field in region 2 in V/m

+Dt1=epsilon_0*Et1 // tangential component of electric flux density D1

+D2=epsilon_2*E2 // electric flux density in region 2 in C/m^2

+disp(E2,"electric field in region 2 in V/m:")

+disp(D2,"electric flux density in region 2 in C/m^2:")