Application of series resonance is

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Q meter

Explanation: The correct answer is B) Q meter, which is a device used to measure the quality factor (Q) of a coil or an inductor. Series resonance is utilized in Q meters to determine the Q factor. Q factor is a measure of the ratio of the reactance of the coil to its resistance. Working Principle: The Q meter works on the principle of series resonance, where the impedance of the circuit is minimum and the current is maximum. At resonance, the inductive reactance equals the capacitive reactance, resulting in a purely resistive impedance. The Q factor is then calculated using the formula $Q = \frac{\omega L}{R}$, where $\omega$ is the resonant frequency, $L$ is the inductance, and $R$ is the resistance. Key Formulas: $Q = \frac{\omega L}{R}$ — Quality factor of a coil or inductor; $\omega = \frac{1}{\sqrt{LC}}$ — Resonant frequency in a series RLC circuit Key Points: Q meter is used to measure the Q factor of a coil; Series resonance is utilized in Q meters Advantages: High accuracy in Q factor measurement; Simple and reliable operation Disadvantages: Limited frequency range; Requires calibration Applications: Measuring Q factor of coils and inductors; Tuning circuits Additional Info: Standard Values: The standard values of Q factor vary depending on the application and type of coil or inductor. Wrong Options Explained: Option A (Oscillators) and Option C (Induction Heating) and Option D (Tuned Tank Circuit) do not directly utilize series resonance for their primary function Answer: B is correct — Q meter is the application of series resonance Exam Tip: For competitive exams, remember that Q factor is a critical parameter in many electrical circuits and devices, and series resonance is a fundamental concept in understanding circuit behavior.

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