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+//CHAPTER 4_ Motion and Dimensional Measurement
+//Caption : Strain gage
+// Example 3// Page 176
+disp("Rg=120")
+disp("Sg=2;")
+disp("Rs=120000")
+Rg=120;    // given
+Sg=2;  // gage factor
+Rs=120000   //('enter the value of shunt resistor=:')
+disp("The input bridge excitation is represented by Eex")
+A=10   //('enter the amplifier gain=:')
+// The shunt resistance has to be very large since we intend to measure only very small change in resistanc
+eo=30*10^-3    //('enter the unbalanced bridge voltage=:')
+dR=Rg/(Rg+Rs);
+r=1;//ratio of resistances of adjacent arms
+Eex=eo*(1+r)^2/(r*dR*A);
+printf('The input excitation voltage is %fd V\n',Eex)
+p1=2 *(1+v) // bridge factor
+Eo=.5   //('enter the voltmeter reading when shunt is removed=:')
+E_axial=Eo*(1+r)^2/(r*Sg*p1*Eex*A);
+printf(' Axial strain is %fd\n ',E_axial)
+E_trans=E_axial*v;
+printf('The transverse strain is -%fd',E_trans)