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diff --git a/147/CH18/EX18.3/Example18_3.sce b/147/CH18/EX18.3/Example18_3.sce
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+close();
+clear;
+clc;
+//resistance of moving coil voltmeter 'R', potential difference across terminals 'V', dimensions of moving coil 'l*d', number of turns 'N', flux density in gap 'B', final deflection 'theta'
+R = 200; //ohm
+V = 100*10^(-3); //V
+l = 30*10^(-3); //m
+d = 25*10^(-3); //m
+N = 100;
+B = 0.2; //Wb/m^2
+theta = 100; //degree 
+//current in instrument for full scale deflection 'I'
+I = V/R; //A
+//control constant of spring 'K2'
+K2 = N*B*l*d*I/theta; //Nm/degree
+mprintf("Control constant of spring, K2 = %0.1e Nn/degree",K2);
+\ No newline at end of file