initial commit / add all books

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diff --git a/1938/CH2/EX2.10/2_10.jpg b/1938/CH2/EX2.10/2_10.jpg
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diff --git a/1938/CH2/EX2.10/2_10.sce b/1938/CH2/EX2.10/2_10.sce
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+clc,clear

+printf('Example 2.10\n\n')

+

+V=250

+R_a=0.15, R_se=0.1, R_x=0.1 //Resitance of armature , series field winding and extra resistance

+N_1 = 800 //initial speed before load torque is increased

+I_1= 30 , I_a1=I_1 , I_se1 = I_1  //initial currents

+

+T_2_by_T_1 = 1 + (50/100)  //50 percent increase as mentioned in question

+I_se2_by_I_a2 = R_x/(R_x + R_se)  //from the figure

+

+//T (prop.) phi*I_a (prop.) I_sh*I_a and T_1=T_2 and simplifying ,solving further 

+I_a2=sqrt(I_a1*I_se1*T_2_by_T_1/I_se2_by_I_a2) //new armature current

+I_se2 = I_se2_by_I_a2 *I_a2 //new series field current

+

+E_b1 = V - I_a1*R_a - I_se1*R_se //indiced emf initially

+E_b2 = V - I_a2*R_a - I_se2*R_se //new induced emf

+N_2 = N_1 * (E_b2/E_b1) * (I_se1/I_se2) //required speed

+printf('The required running speed of motor is %.3f r.p.m',N_2)