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+// Exa 7.20
+
+clc;
+clear;
+
+// Given
+
+// A Capacitence Transducer
+A = 5*10^-4; // Area in m^2
+C = 9.5*10^-12; // Capacitence in farad
+er = 81; //  Relative dielectric constant
+e0 = 8.854*10^-12; // Absolute dielectric constant in F/m
+
+// Solution
+
+// C = e0*er*A/d;
+// Therefore
+d = e0*er*A/C;
+printf('The plate separation d = %.2f mm \n',d*10^3);
+S = e0*er*A/d^2;
+
+printf(' Sensitivity s = %.3f * 10^-8 F/m \n',S*10^8);