initial commit / add all books

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+//Caption:Calculate (i)-Hull cut-off voltage ,(ii)-cut-off magnetic flux density if beam voltage V_o is 6000V, (iii)-cyclotron frequency in GHz

+//Exa:8.8

+clc;

+clear;

+close;

+e_m_ratio=1.759*10^11;//(e/m)

+R_a=0.15;//in m

+R_o=0.45;//in m

+B_o=1.2*10^-3;//in weber/m^2

+V_o={(e_m_ratio)*B_o^2*R_o^2*[1-(R_a/R_o)^2]^2}/8;

+//Given:

+V=6000;//in volts

+B_c=sqrt(8*V/e_m_ratio)/[[1-(R_a/R_o)^2]*(R_o)];//in weber/m^2

+w_c=(e_m_ratio)*B_o;

+f_c=w_c/(2*%pi);//in Hz

+disp(V_o,'Cut-off voltage (in volts) =');

+disp(B_c*10^5,'Cut-off magnetic flux density (in milli weber/sq. m) =');

+disp(f_c*10^-9,'Cyclotron frequency (in GHz) =');

+

+//Answer in book is wrongly given as: f_c=0.336Hz & V_o=50.666 kV
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