98. Which of these formulas would be used to determine t a. b. C. fR L= C = ..... 1 2TVLC 1 4π2fp?C R 1 4π²f²L

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**Title: Determining the Resonant Value of Inductance in AC Circuits**

**Introduction:**

In alternating current (AC) circuits, resonance occurs when the reactive components (inductive and capacitive) balance each other out. This principle is particularly important when working with LC (inductor-capacitor) circuits. The resonance frequency \( f_R \) is a key parameter and can be used to derive relationships for other quantities like inductance \( L \).

**Question:**

Which of these formulas would be used to determine the resonant value of inductance?

**Options:**

a. \( f_R = \frac{1}{2\pi \sqrt{LC}} \)

b. \( L = \frac{1}{4\pi^2 f_R^2 C} \)

c. \( C = \frac{1}{4\pi^2 f_R^2 L} \)

**Explanation:**

- **Option a** provides the formula for calculating the resonant frequency \( f_R \) in terms of inductance \( L \) and capacitance \( C \).
- **Option b** rearranges the resonance frequency formula to solve for inductance \( L \) in terms of \( f_R \) and \( C \).
- **Option c** rearranges the same principle to solve for capacitance \( C \) given \( L \) and \( f_R \).

**Conclusion:**

For determining the resonant value of inductance, **Option b** is the appropriate formula. This equation shows how to derive \( L \) using the known values of resonant frequency and capacitance in the circuit. Understanding these relationships is crucial for designing circuits that operate efficiently at specific frequencies.
Transcribed Image Text:**Title: Determining the Resonant Value of Inductance in AC Circuits** **Introduction:** In alternating current (AC) circuits, resonance occurs when the reactive components (inductive and capacitive) balance each other out. This principle is particularly important when working with LC (inductor-capacitor) circuits. The resonance frequency \( f_R \) is a key parameter and can be used to derive relationships for other quantities like inductance \( L \). **Question:** Which of these formulas would be used to determine the resonant value of inductance? **Options:** a. \( f_R = \frac{1}{2\pi \sqrt{LC}} \) b. \( L = \frac{1}{4\pi^2 f_R^2 C} \) c. \( C = \frac{1}{4\pi^2 f_R^2 L} \) **Explanation:** - **Option a** provides the formula for calculating the resonant frequency \( f_R \) in terms of inductance \( L \) and capacitance \( C \). - **Option b** rearranges the resonance frequency formula to solve for inductance \( L \) in terms of \( f_R \) and \( C \). - **Option c** rearranges the same principle to solve for capacitance \( C \) given \( L \) and \( f_R \). **Conclusion:** For determining the resonant value of inductance, **Option b** is the appropriate formula. This equation shows how to derive \( L \) using the known values of resonant frequency and capacitance in the circuit. Understanding these relationships is crucial for designing circuits that operate efficiently at specific frequencies.
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