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+// Exa 7.21
+
+clc;
+clear;
+
+// Given
+
+// A 5-plate transducer
+n = 5; // no of plates
+l = 20*10^-3; // length of plate in m
+b = 20*10^-3; // breadth of plate in m
+d = 0.25*10^-3; // separation between plates in m
+
+// Solution
+
+A = l*b; // Area in mm^2
+er = 1; //  Relative dielectric constant
+e0 = 8.854*10^-12; // Absolute dielectric constant in F/m
+
+S = (n-1)*e0*er*A/d^2;
+
+printf('Sensitivity of the arrangement = %.3f * 10^-9 F/m \n',S*10^9);
+
+// The answer provided in the textbook is wrong
+