In a doubly excited magnetic system of salient pole stator and rotor, the magnetic torque (Te) depends on

the differential changes of current di s and di r

the instantaneous values of currents is and ir

the angular rate of change of inductances

the differential changes of current dis and dir

only the instantaneous values of self inductance

In a doubly excited magnetic system of salient pole stator and rotor,

1.	In a doubly excited magnetic system of salient pole stator and rotor, the magnetic torque (T_e) depends on
A.	the instantaneous values of currents i<sub>s</sub> and i<sub>r</sub>
B.	the angular rate of change of inductances
C.	the differential changes of current di<sub>s</sub> and di<sub>r</sub>
D.	only the instantaneous values of self inductance
Answer» C. the differential changes of current di<sub>s</sub> and di<sub>r</sub>