initial commit / add all books

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diff --git a/83/CH2/EX2.5/example_2_5.sce b/83/CH2/EX2.5/example_2_5.sce
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+//Chapter 2
+//Example 2.5
+//page 63
+//To find flux linkages with neutral and voltage induced in neutral
+//To find voltage drop in each of three-phase wires
+
+clear;clc;
+Ia=-30+%i*50;
+Ib=-25+%i*55;
+Ic=-(Ia+Ib);
+
+//(a) to find flux linkages with neutral and voltage induce in it
+Dan=4.5;
+Dbn=3;  //from figure
+Dcn=1.5;
+Phi_n=2*10^(-7)*(Ia*log(1/Dan)+Ib*log(1/Dbn)+Ic*log(1/Dcn));
+Vn=%i*2*%pi*50*Phi_n*15000; //voltage induced for 15km long TL
+Vn=abs(Vn) ;
+printf("\nFlux linkages of the neutral wire = %f Wb-T/m\n\n",Phi_n);
+printf("Voltage induced in the neutral = %d\n\n",Vn);
+
+//(b) to find voltage drop in each phase
+Phi_a=2*10^(-7)*(Ia*log(1/(0.7788*0.005))+Ib*log(1/1.5)+Ic*log(1/3));
+Phi_b=2*10^(-7)*(Ib*log(1/(0.7788*0.005))+Ia*log(1/1.5)+Ic*log(1/1.5));
+Phi_c=2*10^(-7)*(Ic*log(1/(0.7788*0.005))+Ib*log(1/1.5)+Ia*log(1/3));
+
+delta_Va=%i*2*%pi*50*Phi_a*15000; //like we did for neutral voltage
+delta_Vb=%i*2*%pi*50*Phi_b*15000;
+delta_Vc=%i*2*%pi*50*Phi_c*15000;
+
+printf("The Voltage drop of phase a(in volts) =");disp(delta_Va);
+printf("\n\nThe Voltage drop of phase b(in volts) =");disp(delta_Vb);
+printf("\n\nThe Voltage drop of phase c(in volts) =");disp(delta_Vc);
+
diff --git a/83/CH2/EX2.5/result_example_2_5.txt b/83/CH2/EX2.5/result_example_2_5.txt
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+
+Flux linkages of the neutral wire = 0.000010 Wb-T/m
+
+Voltage induced in the neutral = 99
+
+The Voltage drop of phase a(in volts) = 
+  - 349.1594 - 204.26943i  
+
+
+The Voltage drop of phase b(in volts) = 
+  - 308.62198 - 140.28272i  
+
+
+The Voltage drop of phase c(in volts) = 
+    621.85121 + 328.22026i