initial commit / add all books

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diff --git a/1523/CH2/EX2.26/2_26.sce b/1523/CH2/EX2.26/2_26.sce
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+//Network Theorem 1

+//page no-2.30

+//example2.26

+disp("Applying KCL to node 1:");

+disp("5*V1-2*V2 = -24");....//equation 1

+disp("Applying KCL to node 2:");

+disp("10*V1-31*V2+6*V3 = 300");...//equation 2

+disp("Applying KCL to node 3:");

+disp("-4*V2 +9*V3 = 160");...//equation 3

+disp("Solving equations 1,2 and 3");...//solving equations in matrix form

+A=[5 -2 0;10 -31 6;0 -4 9];

+B=[-24 300 160]'

+X=inv(A)*B;

+disp(X);

+disp("V1= -8.77 V");

+disp("V2= -9.92 V");

+disp("V3= 13.37 V");

+x=13.37;

+y=-9.92;

+z=(x-y)/5;

+printf("\ncurrent through the 5 ohm resistor = V3-V2/5 = %.2f A",z);