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+// Exa 6.3
+
+clc;
+clear;
+
+// Given
+
+//Fig 6.41 shows an AC bridge
+R1 = 800; // Ohms
+C1 = 0.4; // microFarad
+R2 = 500; // Ohms
+C2 = 1.0; // microFarad
+R3 = 1200; // Ohms
+
+
+// Solution
+
+// Z = R + j X;
+// Z1 = 800 + j/(w*C1)
+// Y2 = 1/R2 - j*(w*C2)
+//Z3 = 1200
+
+printf('At balance, Z1/Z4 = Z2/Z3 \n');
+
+printf(' Rearranging the equation, Z4 = Z1*Z3*Y2 \n') ;
+printf(' Equating the real and imaginary parts on both sides, \n');
+Z4 = R1*R3*1/R2;
+w = sqrt(C1*C2);
+printf(' The value of R in arm DA to produce a balance = %d ohms \n',Z4);
+printf(' The value of frequency at balance = %.4f Hz \n',w/(2*%pi));
+
+// The answers given in textbook for R and f are incorrect