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diff --git a/2528/CH4/EX4.9/Ex4_9.sce b/2528/CH4/EX4.9/Ex4_9.sce
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+clc;
+clear;
+close;
+//pagec no 107
+//Figure 4.13
+Ri=20*10^3;     //In Ohm
+Vin=0.4;        //In Volt
+Rl=1*103;//In ohm
+gm=1/Ri;        //unit-micro*Siemens
+Iload=gm*Vin;
+disp("A",Iload,"Load current is");
+//maximum current is 20microAmp in Op Amp
+Vout=(Ri+Rl)*Iload;
+disp("V",Vout,"V max ");