Question

When is induced EMF maximum in a coil of an ac generator?

Answer 1

Hi friend,

The The formula for induced emf in a.c is

e=NBA(omega) sin (omega)t.

The maximum value of the induced emf is

e=Eo sin(omega)t

When the angle (omega)t=π/2

e=Eo ( which is positive maximum).

Hope this helps you

Answer 2

Hi friend,

Induced emf in a coil=BAnωsinωt
B=magnetic field ,A=area,n=number of turns
e=BAnωsinωt
Max emf is given by
e=E₀sinωt
max value of sinθ is 1 
therefore induced emf will be max when sinωt=1
                                                                 sinωt=sin90
 ⇒⇒⇒⇒⇒ωt=90=π/2