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Physics · 2023 · 3 marks
CBSE 2023 · Region 2 · Set 3 · Q30
A resistor of 50 Ω, a capacitor of (25/(π)) μ F and an inductor of (4/(π)) H are connected in series across an ac source whose voltage (in volt) is…
A resistor of $\displaystyle 50 \Omega$, a capacitor of $\displaystyle \left(\frac{25}{\pi}\right) \mu \mathrm{F}$ and an inductor of $\displaystyle \left(\frac{4}{\pi}\right) \mathrm{H}$ are connected in series across an ac source whose voltage (in volt) is given by $\displaystyle \mathrm{V}=70 \sin (100 \pi \mathrm{t})$. Calculate :
(a)
the net reactance of the circuit,
(b)
the impedence of the circuit
(c)
the effective value of current in the circuit.
Marking-scheme solution
Finding\[\begin{gathered}
R=50 \Omega, \\
\mathrm{V}_{0}=70 \mathrm{~V} \\
\omega=100 \pi
\end{gathered}
\]
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CBSE Class 12 Physics past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.