Analog and electronic circuits

How does the magnitude of an inductor's impedance change as frequency increases?

  1. AIt does not change
  2. BIt decreases
  3. CIt increases
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Answer: C. It increases

The impedance of an inductor has magnitude 2πfL, which increases in proportion to frequency. It passes DC easily and blocks higher frequencies more strongly, so it is used, for example, in choke coils that stop noise on power lines.

  • A. An inductor's impedance changes in proportion to frequency.
  • B. A capacitor's impedance is the one that decreases with frequency.
  • C. Correct. Since it is 2πfL, it increases with frequency.
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