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diff --git a/2273/CH3/EX3.13/ex3_13.sce b/2273/CH3/EX3.13/ex3_13.sce
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+//find the clearance of conductor from ground i)At its lowest elevation ii)the min clearance of the line
+clear;
+clc;
+//soltion
+//given
+W=.8;//kg/m//Line conductor wieght
+L=300;//meter//span of the line
+T=1500;//kg//max allowable tension
+T1=30;//m//height of the towers
+g=1/20;//tan Θ//ground slope
+h=L*g//m//vertical distance between two towers
+T2=T1+h;//m//height of the tower along the slope
+x1=L/2-(T*h)/(W*L);
+printf("Distance between tower on ground and sag=x1= %.2fm\n",x1);
+S1=(W*x1^2)/(2*T);
+printf("Sag for tower on ground(S1)= %.5fm\n",S1);
+S2=(W*(L-x1)^2)/(2*T);
+printf("Sag for tower on hill(S2)= %.5fm\n",S2);
+C=T1-S1-x1*g;
+printf("Clearance of conductor from lowest elevation= %.5fm\n",C);
+x=poly(0, 'x');
+C1= poly([C -g W/(2*T)],'x','c');
+d=derivat(C1);
+xa=roots(d);
+Ca=C-g*xa+W/(2*T)*xa^2;
+printf("Minimum clearance from ground= %dm",Ca);