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+//Chapter 21, Problem 11
+clc;
+f=50;                           //frequency
+v1=500;                         //primary voltage
+v2=100;                         //secondary voltage
+B=1.5;                          //maximum core flux density
+A=50e-4;                        //effective core cross-sectional area
+phim=B*A;                       //maximum flux
+n1=v1/(4.44*f*phim);            //primary turns
+n2=v2/(4.44*f*phim);            //secondary turns
+printf("Primary turns = %d turns\n\n",n1);
+printf("Seconadry turns = %d turns\n\n",n2);