What is the formula for the active power in the cylindrical rotor synchronous machine? (Eb represents armature emf, Vt represents terminal voltage, represents rotor angle, X represents reactance)

What is the formula for the active power in the cylindrical rotor sync

1.	What is the formula for the active power in the cylindrical rotor synchronous machine? (Eb represents armature emf, Vt represents terminal voltage, represents rotor angle, X represents reactance)
A.	E<sub>b</sub> V<sub>t</sub> sin X
B.	E<sub>b</sub> V<sub>t</sub><sup>2</sup> sin X
C.	E<sub>b</sub><sup>2</sup> V<sub>t</sub> sin X
D.	E<sub>b</sub> V<sub>t</sub> sin X2
Answer» B. E<sub>b</sub> V<sub>t</sub><sup>2</sup> sin X