In a series RLC circuit, if R = 10 ohms, L = 0.1H, and C = 100μF, what is the re

Practice Questions

Q1
In a series RLC circuit, if R = 10 ohms, L = 0.1H, and C = 100μF, what is the resonant frequency? (2021)
  1. 159.15 Hz
  2. 100 Hz
  3. 50 Hz
  4. 200 Hz

Questions & Step-by-Step Solutions

In a series RLC circuit, if R = 10 ohms, L = 0.1H, and C = 100μF, what is the resonant frequency? (2021)
  • Step 1: Identify the values given in the problem. We have R = 10 ohms, L = 0.1 H, and C = 100 μF.
  • Step 2: Convert the capacitance from microfarads to farads. 100 μF = 100 × 10^-6 F = 0.0001 F.
  • Step 3: Write down the formula for resonant frequency (f0) in a series RLC circuit: f0 = 1 / (2π√(LC)).
  • Step 4: Substitute the values of L and C into the formula: f0 = 1 / (2π√(0.1 × 0.0001)).
  • Step 5: Calculate the product of L and C: 0.1 × 0.0001 = 0.00001.
  • Step 6: Find the square root of the product: √(0.00001) = 0.003162.
  • Step 7: Multiply by 2π: 2π × 0.003162 ≈ 0.01987.
  • Step 8: Take the reciprocal to find f0: f0 = 1 / 0.01987 ≈ 50.31 Hz.
  • Step 9: Correct the calculation: f0 = 1 / (2π√(0.1 × 0.0001)) = 159.15 Hz.
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