\(LCR\) શ્રેણી પરિપથમાં \(30 \,{mH}\) ઇન્ડકટર અને \(1 \, \Omega\) અવરોધને \(300 \, {rad} / {s}\) કોણીય આવૃતિ ધરાવતા \(AC\) ઉદગમ સાથે જોડેલ છે. પ્રવાહને વોલ્ટેજ કરતાં \(45^{\circ}\) આગળ રાખવા માટે જરૂરી કેપેસીટરનું મૂલ્ય \(\frac{1}{x} \times 10^{-3} \, {F}\) હોય, તો \(x\) નું મૂલ્ય કેટલું હશે?

A \(3\)
B \(5\)
C \(7\)
D \(9\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(3\)

Step-by-step Solution

Detailed explanation

\(\tan \phi=\frac{x_{C}-x_{L}}{R}\) \(\tan 45=\frac{x_{C}-x_{L}}{R}\) \(X_{C}-X_{L}=R\) \(\frac{1}{\omega C}-\omega L=R\) \(\frac{1}{\omega C}-300 \times 0.03=1\) \(\frac{1}{\omega C}=10\) \(C=\frac{1}{10 \omega}=\frac{1}{10 \times 300}\) \(C=\frac{1}{3} \times 10^{-3}\) \(X=3\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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