Analog and electronic circuits

Which expression gives the resonant frequency of a series LC circuit?

  1. A2π√(LC)
  2. B1 / (2π√(LC))
  3. C√(L / C)
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Answer: B. 1 / (2π√(LC))

An LC circuit resonates at the frequency where the inductor's reactance 2πfL equals the capacitor's reactance 1/(2πfC). Solving gives f = 1 / (2π√(LC)). It is used in the design of oscillators, tuned circuits and filters.

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