In an $AC$ generator, induced emf $\varepsilon = 0$ at $t = 0$, then its value . . . . . .
- Aminimum at time $\frac{2\pi}{3\omega}$
- Bminimum at time $\frac{\pi}{2\omega}$
- Cmaximum at time $\frac{2\pi}{\omega}$
- Dmaximum at time $\frac{\pi}{2\omega}$
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Similar Questions
The peak value of an alternating emf $e$ given by $e = e_0 \cos \omega t$ is $10 \ V$ and its frequency is $50 \ Hz$. At time $t = \frac{1}{600} \ s$,the instantaneous e.m.f is:
An $ac$ current is represented as $i = 5 \sqrt{2} + 10 \cos \left(650 \pi t + \frac{\pi}{6}\right) \text{ A}$. The $r.m.s$ value of the current is:
$A$ resistance of $20 \Omega$ is connected to a source of an alternating potential $V = 200 \sin (10 \pi t)$. If $t$ is the time taken by the current to change from the peak value to rms value,then $t$ is (in seconds).
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