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+//===========================================================================
+//chapter 5 example 13
+
+clc;clear all;
+
+//variable declaration
+V1  = 50*10^-3;         //voltage in V
+I1   = 5;               //current in A
+I2  = 10;               //current  in A
+v1    =4; 
+v2    =4.2;
+
+//calculations
+//v1     = (r+R1)*I1
+//v1     = (r+R1)*I2
+//since potential difference is same in both cases 
+//v1= v2
+R1    = V1/(I1);
+R2    = V1/(I2);
+r      = ((v2*R2)-(v1*R1))/(v1-v2);
+v      = (r+R1)*v1;         //potential difference in V
+I       = v/(r);            //current when neither meter in the circuit in A
+
+//result
+mprintf("current when neither meter in the circuit = %3.2f A",I);
+