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+//Calculate frequency of rotor induced emf
+//Chapter 4
+//Example 4.4
+//page 293
+clear;
+clc; 
+disp("Example 4.4")
+Nr=1440;                //rotor speed in rpm
+f=50;                    //frequency in hertz
+//calculating Ns for values of P=2,4,6,8 etc
+//by checking P=4
+P=4;
+Ns=(120*f)/P;                 //Synchronous speed
+S=(Ns-Nr)/Ns;                //slip
+Fr=S*f;                       //rotor frequency
+printf("Rotor frequency=%dHz",Fr)
+