initial commit / add all books

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+//Exa2.19

+clc;

+clear;

+close;

+disp("Let R0 be the resistance of the coil at 0 degree C and alpha0 be its temperature coefficient of resistance at 0 degree C");

+disp("Resistance at 20 degree C, 18 = R0 * (1+20*alpha0)                (i)");

+disp("Resistance at 50 degree C, 20 = R0 * (1+50*alpha0)                (ii)");

+disp("Dividing Eq.(ii) by Eq.(i), we have");

+disp("20/18= (1+50*alpha0)/(1+20*alpha0)");

+disp("or alpha0 = 1/250=0.004 ohm/ohm/degree C");

+disp("If t degree C is the temperature of coil when its resistance is 21 ohm, then");

+disp("21=R0*(1+0.004*t)");

+disp("Dividing Eq.(iii) by Eq.(ii), we have");

+disp("21/20=(1+0.004*t)/(1+50*0.004)");

+disp("or t=65 degree C");

+disp("Temperature rise = t-surrounding temperature = 65 - 15 = 50 degree C");

+