initial commit / add all books

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diff --git a/1271/CH9/EX9.4/4.txt b/1271/CH9/EX9.4/4.txt
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+ Value of e_r is 5 . 

+ Total dipole moment of the slab is 2.000000e-04 C-m.

diff --git a/1271/CH9/EX9.4/example9_4.sce b/1271/CH9/EX9.4/example9_4.sce
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+clc 
+// Given that
+D = 5e-4 // electric displacement vector in C/m^2
+P = 4e-4 // electric polarization vector in C/m^2
+v = 0.5 // volume of the slab in m^3
+e_ = 8.85e-12 // electric permittivity of air in C^2/Nm^2
+// Sample Problem 4 on page no. 9.12
+printf("\n # PROBLEM 4 # \n")
+printf(" Standard formula used \n")
+printf(" D= e_*E.\n\n ")
+E= (D-P)/ e_
+k = D/(e_*E)
+p = P*v
+energy_density = 1/2 * k*e_*E^2
+printf("Value of relative permittivity is %d. \n Total dipole moment of the slab is %e C-m.",k,p )