In a doubly excited magnetic system with salient pole type stator and rotor, if the rotor is not allowed to move, then the equation for magnetic field stored energy in establishing the currents from zero to is and ir is __________

W fld =1/2 i r 2 L r +M rs i s i r

Wfld=1/2 is2Ls+1/2 ir2Lr+Mrs is ir

In a doubly excited magnetic system with salient pole type stator and

1.	In a doubly excited magnetic system with salient pole type stator and rotor, if the rotor is not allowed to move, then the equation for magnetic field stored energy in establishing the currents from zero to i_s and i_r is __________
A.	W<sub>fld</sub>=1/2 i<sub>s</sub><sup>2</sup>L<sub>s</sub>+1/2 i<sub>r</sub><sup>2</sup>L<sub>r</sub>
B.	W<sub>fld</sub>=1/2 i<sub>s</sub><sup>2</sup>L<sub>s</sub>+M<sub>rs</sub> i<sub>s</sub> i<sub>r</sub>
C.	W<sub>fld</sub>=1/2 i<sub>s</sub><sup>2</sup>L<sub>s</sub>+1/2 i<sub>r</sub><sup>2</sup>L<sub>r</sub>+M<sub>rs</sub> i<sub>s</sub> i<sub>r</sub>
D.	W<sub>fld</sub>=1/2 i<sub>r</sub><sup>2</sup>L<sub>r</sub>+M<sub>rs</sub> i<sub>s</sub> i<sub>r</sub>
Answer» D. W<sub>fld</sub>=1/2 i<sub>r</sub><sup>2</sup>L<sub>r</sub>+M<sub>rs</sub> i<sub>s</sub> i<sub>r</sub>