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diff --git a/165/CH4/EX4.23/ex4_23.sce b/165/CH4/EX4.23/ex4_23.sce
new file mode 100644
index 000000000..c9e02a357
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+++ b/165/CH4/EX4.23/ex4_23.sce
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+//Example 4.23
+close;
+clc;
+
+E=3;                  //in volts
+Im=1*10^-3;           //in amperes
+//After aging battery sterngth
+E1=2.8;               //in volts
+
+Rt=E/Im;              //Initial internal resistence
+Rt1=E1/Im;            //Internal resistence after battery aging
+e=(Rt-Rt1)*100/Rt;    //% error in reading
+
+printf('\nTotal internal resistence of ohmmeter = %.2f k ohm\n',Rt/1000)
+printf('\nInternal resistence of ohmmeter after battery decay = %.2f k ohm\n',Rt1/1000)
+printf('\nPercentage error in reading = %.2f percent\n',e)
+\ No newline at end of file