Question

In A.C generator, induced e.m.f is zero at time t=0, the induced e.m.f at time pie by 2w a) -Vm b) +Vm c) zero d) +2Vm

Answer 1

Answer:

The induced e.m.f at time pie by 2w is Vm

Explanation:

EMF induced in AC generator is given by equation

$V = V_m sin(\omega t + \phi)$

here we know that at t = 0 the induced EMF is ZERO

so we will have

$0 = V_m sin(\omega 0 + \phi)$

so we have

$\phi = 0$

now we have

$V = V_m sin(\omega t)$

now  at time [/tex]t = \frac{\pi}{2\omega}[/tex] we have

$V = V_m sin(\omega \times \frac{\pi}{2\omega})$

$V = V_m$

#Learn

Topic : AC generator

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