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diff --git a/2102/CH4/EX4.29/exa_4_29.sce b/2102/CH4/EX4.29/exa_4_29.sce
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+// Exa 4.29
+clc;
+clear;
+close;
+k= 1.38*10^-23;
+T= 300;// in K (assume)
+V_D= 0.7;// The depletion voltage for silicon
+e=1.6*10^-19;// in C
+// n_n/n_p= p_p/p_n = %e^(e*V_D/(k*T))
+ratio= %e^(e*V_D/(k*T));// ratio of majority to minority charge carriers in n and p of a silicon semiconductor
+disp(ratio,"Ratio of majority to minority charge carriers in n and p of a silicon semiconductor is : ")