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+//find ratio of ground to mutual capacitance, system line voltage and string efficiency
+clear;
+clc;
+//soltion
+//given
+V2=20;//kV
+V3=25;//kV
+k=poly(0,"k");
+k=roots(V2*(1+3*k+k*k)-V3*(1+k));
+k=0.13;//Considering only positive part
+V1=V2/(1+k);
+V=V1+V2+V3;
+Se=V*100/(3*V3);
+printf("K =%.2f \nSystem line voltage(V)= %.3fkV \nString Efficiency= %.1f percent",k,V,Se);