Question

If the peak value of alternating emf is 15v what is the mean value over half cycle​

Answer 1

${\pmb{\underline{\sf{Direct \: Solution.}}}}$

Em=$\frac{2}{\pi}$ $\in _{0}$

$Em = \frac{2}{\pi} \times 15 \\ \implies \boxed{9.54 \: v}$