A three phase induction motor is sometimes called a generalized transformer in so far as voltage and frequency transformation has been concerned. Then the rotor emf E2 and the rotor current I2 are zero at _________

A three phase induction motor is sometimes called a generalized transf

1.	A three phase induction motor is sometimes called a generalized transformer in so far as voltage and frequency transformation has been concerned. Then the rotor emf E2 and the rotor current I2 are zero at _________
A.	Ns
B.	2Ns
C.	Zero
D.	Slip of 50%
Answer» B. 2Ns