Match the following current $\text{r.m.s.}$ values:
$(A) \ x_0 \sin \omega t$$(i) \ x_0$
$(B) \ x_0 \sin \omega t \cos \omega t$$(ii) \ \frac{x_0}{\sqrt{2}}$
$(C) \ x_0 \sin \omega t + x_0 \cos \omega t$$(iii) \ \frac{x_0}{2 \sqrt{2}}$

  • A
    $(A \rightarrow i), (B \rightarrow ii), (C \rightarrow iii)$
  • B
    $(A \rightarrow ii), (B \rightarrow iii), (C \rightarrow i)$
  • C
    $(A \rightarrow i), (B \rightarrow iii), (C \rightarrow ii)$
  • D
    None

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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:

Match the following:
Currents $r.m.s.$ values
$(A) \ x_0 \sin \omega t$ $(i) \ x_0$
$(B) \ x_0 \sin \omega t \cos \omega t$ $(ii) \ \frac{x_0}{\sqrt{2}}$
$(C) \ x_0 \sin \omega t + x_0 \cos \omega t$ $(iii) \ \frac{x_0}{2\sqrt{2}}$

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The frequency of $AC$ mains in India is ....... $Hz$.

The alternating current is given by $i = \left\{\sqrt{42} \sin \left(\frac{2 \pi}{T} t\right) + 10\right\} \text{ A}$. The $r.m.s.$ value of this current is $\text{A}$.

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