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+// Exa 7.7
+
+clc;
+clear;
+
+// Given
+
+Gf = 2 ; // Gauge factor of strain gauge
+S = 1000; // Stress in kg/cm^2
+E = 2*10^6; // Youngs Modulus in kg/cm^2
+
+// Solution
+
+e = S/E; // strain
+
+dR_R = e*Gf; // change in resistance
+ // Gf = 1+2u;
+// Therefore
+u = (Gf-1)/2; // poissons ratio
+
+printf('The percentage change in resistance of strain gauge = %.1f \n',dR_R*100);
+printf(' Poissons ratio  = %.2f \n',u);