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+//Chapter-9,Example9_24,pg 9_77
+R=1
+V1=230
+N1=300
+Ia1=15
+N2=375
+//using torque equation T=k*N^2
+Ia2=N2*Ia1/N1
+//using speed equation N=k*Eb/Ia........(1)
+Eb1=V1-Ia1*R
+//case-2
+//Eb2=V2-Ia2*R=V2-18.75......(2)
+//putting (2) in (1)
+V2=(N2*Eb1*Ia2/(N1*Ia1))+18.75
+printf("new supply voltage\n")
+printf("V2=%.3f V",V2)