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diff --git a/2780/CH12/EX12.1/Ex12_1.sce b/2780/CH12/EX12.1/Ex12_1.sce
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+clc
+//to calculate electric flux
+//electric flux through a surface is phi=vector(E)*vector(s)
+//where vector E=2i+4j+7k,vector s=10j
+E=4                  //E=4j
+s=10                   //s=10j
+phi=E*s
+disp("electric flux is phi="+string(phi)+"units")
+//to calculate flux coming out of any face of the cube
+q=1          //charge in coulomb
+epsilon0=8.85*10^-12             //permittivity in free space in coul^2/N-m^2
+phi1=q/(6*epsilon0)
+disp("flux coming out of any face of the cube is phi1="+string(phi1)+"N-m^2/coul^2")