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Physics · 2008
NEET 2008 · Prelims · Code A · Q39
In an a.c. circuit the e.m.f. (e) and the current (i) at any instant are given respectively by: e= E_o sin ω t; i= I_o sin (ω t -φ) The average power…
In an a.c. circuit the e.m.f. (e) and the current (i) at any instant are given respectively by :
$$\begin{aligned}
& e=\mathrm{E}_{\mathrm{o}} \sin \omega \mathrm{t} \\
& i=\mathrm{I}_{\mathrm{o}} \sin (\omega \mathrm{t}-\phi)
\end{aligned}
$$
The average power in the circuit over one cycle of a.c. is :
Official answer
(4)
$\displaystyle \frac{\mathrm{E}_{\mathrm{o}} \mathrm{I}_{\mathrm{o}}}{2} \cos \phi$
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NEET (UG) 2008 Physics question, with the answer from NTA’s final answer key. Where our answers come from.