Main flux produced by the field winding of alternator

Q.  If ∅f is the main flux produced by the field winding of alternator is responsible for producing Eph, then
- Published on 27 Oct 15

a. Eph leads ∅f by 90 degree
b. Eph leads ∅f by 45 degree
c. Eph lags ∅f by 45 degree
d. Eph lags ∅f by 90 degree

ANSWER: Eph lags ∅f by 90 degree

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