initial commit / add all books

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diff --git a/3802/CH4/EX4.19/Ex4_19.sce b/3802/CH4/EX4.19/Ex4_19.sce
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+//Book Name:Fundamentals of Electrical Engineering

+//Author:Rajendra Prasad

+//Publisher: PHI Learning Private Limited

+//Edition:Third ,2014

+

+//Ex4_19.sce.

+

+clc;

+clear;

+r1=3e-2;

+r2=6e-2;

+r3=9e-2;

+q1=9e-12;

+q2=-6e-12;

+q3=3e-12;

+d1=2e-2;

+d2=4e-2;

+d3=7e-2;

+d4=12e-2;

+epsilon_not=8.854e-12;

+a=9e9;                //a=1/(4*%pi*epsilon_not);

+

+printf("\n Field strength and potentials for point a,b,c,d are ,")

+Ea=0;

+printf("\n\t Ea=%g N/C",Ea)

+Va=a*((q1/r1)+(q2/r2)+(q3/r3));

+printf("\n\t Va=%g V \n",Va)

+

+Eb=a*(q1/d2^2);

+printf("\n\t Eb=%g N/C",Eb)

+Vb=a*((q1/d2)+(q2/r2)+(q3/r3));

+printf("\n\t Vb=%g V \n",Vb)

+

+Ec=a*((q1/d3^2)+(q2/d3^2));

+printf("\n\t Ec=%1.2f N/C",Ec)

+Vc=a*((q1/d3)+(q2/d3)+(q3/r3));

+printf("\n\t Vc=%1.3f V \n",Vc)

+

+Ed=(a/d4^2)*(q1+q2+q3);

+printf("\n\t Ed=%g N/C",Ed)

+Vd=(a/d4)*(q1+q2+q3);

+printf("\n\t Vd=%g V \n",Vd)

+//There is a error in book calculation on Vc. In the book Vc=0.762 volt instead of 0.6857 volt