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+//Example 6.3:
+clc;
+clear;
+close;
+//given data :
+format('v',4)
+a=5.6*10^-6/2;// channel width in m
+epsilon0=8.86*10^-12;// in F/m
+epsilon=12*epsilon0;// in F/m
+Nd=10^21;// in m^-3
+e=1.6*10^-19;// in V
+Vp=e*Nd*a^2/(2*epsilon);
+disp(Vp,"Pinch off voltage,Vp(V) = ")