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diff --git a/3760/CH4/EX4.55/Ex4_55.sce b/3760/CH4/EX4.55/Ex4_55.sce
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+clc;
+v=250; // rated voltage of dc series motor
+ra=0.25; // armature resistance
+rf=0.15; // series field resistance
+disp('case a');
+t=80; // developed torque
+n1=1200; // speed at developed torque
+// solving quadratic equation in ia
+t1=ra+rf;
+t2=-v;
+t3=(t*2*%pi*n1)/60;
+p=[ t1 t2 t3];
+ia=roots(p);
+printf('Current for developing given torque is %f A\n',ia(2));
+disp('case b');
+n2=1800; 
+ia2=ia(2)/2; 
+Ea1=v-ia(2)*(ra+rf); // counter EMF corresponding to armature current of case 1
+Ea2=v-ia2*(ra+rf); // counter EMF corresponding to armature current ia2
+fr=(n1*Ea2)/(n2*Ea1); // ratio of fluxes for two armatures current
+pr=(1-fr)*100;
+printf('Percentage reduction in flux is %f pecent',pr);