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In a first-order passive RC low-pass network, the magnitude of the transfer function at the cutoff frequency is approximately what fraction of its low-frequency value?

  • A0.5
  • B0.707
  • C1.0
  • D1.414
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Correct Answer: B. 0.707
Explanation: At the cutoff frequency of a first-order RC network, the magnitude is 1/sqrt(2), approximately 0.707 of the passband value.
Reference: Standard analog electronics: first-order filter cutoff
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