Which of the following correctly gives the relation between the root-mean-square…

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Which of the following correctly gives the relation between the root-mean-square (rms) value

\varepsilon_{\text{rms}}

and the peak value

\varepsilon_0

of the emf generated by a single-phase alternator? (a)

\varepsilon_{\text{rms}}=\dfrac{2\varepsilon_0}{\pi}

(b)

\varepsilon_{\text{rms}}=\varepsilon_0\sqrt{2}

(c)

\varepsilon_{\text{rms}}=\dfrac{\varepsilon_0}{\sqrt{2}}

(d)

\varepsilon_{\text{rms}}=\dfrac{\varepsilon_0}{\sqrt{3}}