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Q.

When the plane of the armature of an a.c. generator is parallel to the field, in which it is rotating

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a

the flux linked with it is zero, while induced emf is maximum

b

both the flux linked and induced emf in the coil area zero

c

flux linked is maximum while induced emf is zero

d

both the flux and emf have their respective maximum values.

answer is B.

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Detailed Solution

ϕ=NAB cosθ=NAB cos90=0

ε=-dt=NBAω sinθ=ε0sinθ

ε=ε0sin90=ε0= maximum 

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When the plane of the armature of an a.c. generator is parallel to the field, in which it is rotating