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diff --git a/608/CH21/EX21.04/21_04.sce b/608/CH21/EX21.04/21_04.sce
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+//Problem 21.04: Determine the generated e.m.f. in problem 21.03 if the armature is wave-wound.
+
+//initializing the variables:
+Z = 1200; // no. of conductors
+p = 4; // let, no. of pairs
+c = 2; // for a wave winding
+Phi = 30E-3; // in Wb
+n = 500/60; // in rev/sec
+
+//calculation:
+//Generated e.m.f., E = 2*p*Phi*n*Z/c
+E = 2*p*Phi*n*Z/c
+
+printf("\n\n Result \n\n")
+printf("\n Generated e.m.f. is %.0f V ",E)
+\ No newline at end of file