# A box $$P$$ and a coil $$Q$$ are connected in series with an ac...

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• Published on:  Sunday, July 31, 2022
• A box $$P$$ and a coil $$Q$$ are connected in series with an ac source of variable frequency. The emf of source is constant at $$10 \mathrm{~V}$$. Box $$P$$ contains a capacitance of $$1 \mu \mathrm{F}$$ in series with a resistance of $$32 \Omega$$. Coil $$Q$$ has a self inductance $$4.9 \mathrm{mH}$$ and a resistance $$68 \Omega$$ in series. The frequency is adjusted so that the maximum current flows in $$P$$ and $$Q$$. At this frequency the voltage across $$P$$ and $$Q$$ respectively are
(a) $$9.76 \mathrm{~V}, 8.92 \mathrm{~V}$$
(b) $$6.29 \mathrm{~V}, 7.96 \mathrm{~V}$$
(c) $$7.70 \mathrm{~V}, 10.92 \mathrm{~V}$$
(d) $$7.70 \mathrm{~V}, 9.76 \mathrm{~V}$$
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• Source: https://youtu.be/Q3gK9vRTf-Q