initial commit / add all books

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diff --git a/2258/CH6/EX6.2/6_2.sce b/2258/CH6/EX6.2/6_2.sce
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+clc();

+clear;

+// To calculate the ratio between electronic and ionic polarizability

+epsilon_r=4.94;

+N=2.69;     //let n^2 be N

+//(epsilon_r-1)/(epsilon_r+2) = (N*alpha)/(3*epsilon_0)

+//alpha = alpha_e+alpha_i

+//therefore (epsilon_r-1)/(epsilon_r+2) = (N*(alpha_e+alpha_i))/(3*epsilon_0)

+//let (N*(alpha_e+alpha_i))/(3*epsilon_0) be X

+X=(epsilon_r-1)/(epsilon_r+2);

+//Ez=n^2

+//therefore (N-1)/(N+2) = (N*alpha_e)/(3*epsilon_0)

+//let (N*alpha_e)/(3*epsilon_0) be Y

+Y=(N-1)/(N+2);

+//dividing X/Y = (N*(alpha_e+alpha_i))/(N*alpha_e)

+//therefore X/Y = 1+(alpha_i/alpha_e)

+//let alpha_i/alpha_e be A

+R=(X/Y)-1;

+printf("ratio between electronic and ionic polarizability is %f",R);

+

+//answer given in the book is wrong in the second part