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diff --git a/3871/CH3/EX3.4/Ex3_4.sce b/3871/CH3/EX3.4/Ex3_4.sce
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+//===========================================================================
+//chapter 3 example 4
+clc;
+clear all;
+
+//variable declaration
+ep     =  5;            //percentage error 
+Am     = 20;            //measuredd value in H
+
+//calculations
+er     = ep/(100);     //relative error 
+//A = Am+dA
+//dA  = er*Am
+A     = Am*(1+er);            //limiting value of inductance in H
+A1    = Am*(1-er);            //limiting value of inductance in H
+
+//result
+mprintf("limits of inductance =%3.2f H",A);
+mprintf("\n and  = %3.2f H",A1);
+