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diff --git a/174/CH5/EX5.4/example5_4.sce b/174/CH5/EX5.4/example5_4.sce
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+// To find the unknown impedence
+// Modern Electronic Instrumentation And Measurement Techniques
+// By Albert D. Helfrick, William D. Cooper
+// First Edition Second Impression, 2009
+// Dorling Kindersly Pvt. Ltd. India
+// Example 5-4 in Page 112
+
+
+clear; clc; close;
+
+// Given data
+// The notations are wrt to the figure 5-10 in page 109
+
+//Arm AB
+R_1 = 450;
+//Arm BC
+R_2 = 300;
+C = 0.265 *(10^-6);
+//Arm DA
+R_3 = 200;
+L = 15.9*(10^-3);
+f = 1000;
+
+//Calculations
+w = 2*%pi*f;
+Z_1 = 450;
+Z_2 = R_2 - %i *floor(1/(w*C));
+Z_3 = R_3 + %i*ceil(w*L);
+
+Z_4 = Z_1*Z_3/Z_2;
+printf("The impedence of the unknown arm = %di ohm\n",imag(Z_4));
+printf("The result indicates that Z_4 is a pure inductance with an inductive reactance of 150 ohm at a frequency of 1 khz.\n")
+
+L_ans = imag(Z_4)/w;
+printf("The inductance present in the arm CD = %0.1fm H",L_ans*1000);
+
+//Result
+// The impedence of the unknown arm = 150i ohm
+// The result indicates that Z_4 is a pure inductance with an inductive reactance of 150 ohm at a frequency of 1 khz.
+// The inductance present in the arm CD = 23.9m H 
+
+
+
+
+
diff --git a/174/CH5/EX5.4/example5_4.txt b/174/CH5/EX5.4/example5_4.txt
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index 000000000..d677ea952
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+++ b/174/CH5/EX5.4/example5_4.txt
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+The impedence of the unknown arm = 150i ohm
+The result indicates that Z_4 is a pure inductance with an inductive reactance of 150 ohm at a frequency of 1 khz.
+The inductance present in the arm CD = 23.9m H