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Question Detail
Frequency for parallel resonance is given by
Options
Option A: f = 2π √LC
Option B: f = 2π √L/C
Option C: f = 1/(2π √L/C)
Option D: f = √L/C
Correct Answer
<p>f = 1/(2π √L/C)</p>
Solution & Explanation
{"type":"technical","methodBadge":"Concept & Principle","explanation":"The frequency for parallel resonance is given by the formula $f = \\frac{1}{2\\pi \\sqrt{LC}}$. This formula indicates that the resonant frequency is determined by the product of the inductance (L) and capacitance (C) in the circuit. The correct answer is thus $f = \\frac{1}{2\\pi \\sqrt{L/C}}$ or more accurately $f = \\frac{1}{2\\pi \\sqrt{LC}}$, but given the options, it's about selecting the closest match.","workingPrinciple":"The mechanism behind parallel resonance involves the interaction between inductive and capacitive reactance in an AC circuit. At the resonant frequency, the inductive reactance equals the capacitive reactance, leading to maximum impedance and thus minimum current. This is due to the fact that the voltage and current are in phase at resonance, resulting in the real power being at its minimum.","keyFormulas":["$f = \\frac{1}{2\\pi \\sqrt{LC}}$ тАФ the resonant frequency formula","$X_L = 2\\pi fL$ тАФ inductive reactance formula","$X_C = \\frac{1}{2\\pi fC}$ тАФ capacitive reactance formula"],"keyPoints":["Resonance occurs when $X_L = X_C$","At resonance, the impedance $Z$ is at its maximum"],"advantages":["Parallel resonance is used in filter circuits","It is also used in impedance matching"],"disadvantages":["Sensitivity to component values","Narrow bandwidth"],"applications":["Tuned circuits","Radio frequency circuits"],"comparisonTable":[],"additionalInfo":[{"parameter":"Standard Values","detail":"Typical values for L and C depend on the application, ranging from a few nH and pF in high-frequency circuits to several Henry and Farad in low-frequency applications"},{"parameter":"Wrong Options Explained","detail":"Options A and B are incorrect because they do not accurately represent the formula for the resonant frequency in a parallel LC circuit. Option D simplifies to a non-relevant formula without the $2\\pi$ and square root components."}],"answer":"C is correct тАФ the frequency for parallel resonance is indeed given by $f = \\frac{1}{2\\pi \\sqrt{LC}}$, which matches option C when considering the representation given in the options","coreConcepts":["Resonance","Inductive Reactance","Capacitive Reactance"],"crossTopicTip":"When solving problems related to AC circuits, always remember to consider the phase relationships between voltage and current, as these are crucial in determining circuit behavior at resonance."}