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diff --git a/3636/CH6/EX6.9/Ex6_9.sce b/3636/CH6/EX6.9/Ex6_9.sce
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+clc;
+clear;
+ni=1.5*10^10 //in cm^-3
+e=1.6*10^-19 //in eV
+Na=10^16 //doping density in cm^-3 
+Nd=10^16 //in cm^-3 
+tau_p0=5*10^-7 //in s 
+tau_n0=5*10^-7 //in s
+Dn=25 //in cm^2/s
+Dp=10 //in cm^2/s
+epsilon_r=11.7 //in F/cm
+epsilon_0=8.85*10^-14 //in F/cm
+myu_n=1350 //in cm^2/V*s
+myu_p=450 //in cm^2/V*s 
+V=0.65 //in V
+Const=0.0259 //constant for kT/e in V
+
+//Calculation
+pn0=ni^2/Nd //in cm^-3
+np0=ni^2/Na //in cm^-3
+Lp=sqrt(Dp*tau_p0) //in cm
+Ln=sqrt(Dn*tau_n0) //in cm
+Js=(((e*Dp*pn0)/Lp)+((e*Dn*pn0)/Lp)) //in A/cm^2
+J=Js*(exp(V/Const)-1) //Total current density in A/cm^2
+sigma=e*myu_n*Nd //in mho/cm
+E=J/sigma
+
+mprintf("Electric field value= %1.2f V/cm",E) //The answer provided in the textbook is wrong