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+//=====================================================================================
+//chapter 12 example 17
+
+
+
+clc;
+clear all;
+
+//variable declaration
+R1         = 3100;         //resistance of arm  in  Ω
+R2         = 25000;         //resistance of arm  in  Ω
+R4         = 100000;         //resistance of arm  in  Ω
+C1        = 5.2*10^-6;        //capacitance in F
+f           = 25000;        //frequency in Hz
+
+//calculations
+//C3      = C1*((R2/R4)-(R1/R3))
+//X     = C1*(R2/R4)
+//Y       = C1*(R1/R3)
+w           = 2*%pi*f;
+x           =1/((w^2)*R1*C1);
+//R3        = x/C3
+A       = (C1*R2)/R4;
+B       = 1+(C1*R1/x);
+C3      = A/B;              //capcitance in uuF
+R3      = x/C3;             //equivalent parallel resistance in   Ω
+
+//result
+mprintf("equivalent parallel resistance = %3.2f K Ω",(R3*10^-3));