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+//Ex 2.15 page 77
+
+clc;
+clear;
+close;
+
+Isb=3000;// A
+f=50;// Hz
+I=sqrt((Isb**2*1/2/f)*f) ;// A
+I2t=I**2/2/f;// sq.A/s
+printf('I2t rating = %d A**2/s',ceil(I2t))
+