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diff --git a/1529/CH9/EX9.20/9_20.sce b/1529/CH9/EX9.20/9_20.sce
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+//Chapter 9, Problem 20
+clc;
+M=0.2;
+dI=10-4;
+dt=10*10^-3;
+N=500;
+E=-M*(dI/dt);
+dphi=(E*dt)/N;
+printf("Induced emf = %d V\n\n\n",E);
+printf("Change of flux = %f mWb",dphi*1000);