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+//Example 7.17 // strain
+clc;
+clear;
+close;
+//given data :
+n=4;
+Rg=200; // in ohm
+Rsh=100*10^3; // in ohm
+Gf=2; // gauge factor
+e=Rg/(n*Gf*(Rg+Rsh));
+// case 1 -when the calibration switch is closed, the read out gives a reading of 140 division
+D=e/140;
+//case 2 - when the strain gauge is loaded, the strain
+S=D*220*10^6;
+disp(S,"the strain,S(microstrain) = ")