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+clc
+
+T=300 //K
+k=8.617*10^-5 //eV/K
+q=1.6*10**-19 //C
+a=10^20// cm^-4
+W=0.809*10^-4
+epsilonx=8.85*10^-14
+epsilonm=((q*a*W^2)/(8*epsilonx*11.9))
+disp(epsilonm,"epsilonm in V/cm =")