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diff --git a/377/CH15/EX15.9/15_9.sce b/377/CH15/EX15.9/15_9.sce
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+disp("Emax=q*Na*d/Єs");
+q=1.6*10^-19;
+Na=6.42*10^18;
+d=50*10^-8;
+es=12.9*8.854*10^-14;//say es=Єs
+Emax=q*Na*d/es;
+printf('\n The value of Emax is %fkV/cm',Emax*10^-3); \ No newline at end of file