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Why does an inductor act as an open circuit at high frequencies?

Why does an inductor act as an open circuit at high frequencies?

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**Why does an inductor act as an open circuit at high frequencies?** Inductors are passive electrical components that store energy in a magnetic field when electric current flows through them. At high frequencies, the impedance of an inductor increases. This is because the impedance (\(Z\)) of an inductor is directly proportional to both the frequency (\(f\)) and the inductance (\(L\)), as expressed in the formula: \[ Z = 2\pi fL \] As the frequency increases, the impedance becomes very large, effectively limiting the current flow through the inductor. Consequently, it behaves like an open circuit in high-frequency applications. This property is utilized in various electronic circuits, including filters and oscillators.
Transcribed Image Text:**Why does an inductor act as an open circuit at high frequencies?** Inductors are passive electrical components that store energy in a magnetic field when electric current flows through them. At high frequencies, the impedance of an inductor increases. This is because the impedance (\(Z\)) of an inductor is directly proportional to both the frequency (\(f\)) and the inductance (\(L\)), as expressed in the formula: \[ Z = 2\pi fL \] As the frequency increases, the impedance becomes very large, effectively limiting the current flow through the inductor. Consequently, it behaves like an open circuit in high-frequency applications. This property is utilized in various electronic circuits, including filters and oscillators.
Expert Solution
Introduction:
  • When AC current flows through an inductor the inductive coil will resist the flow of the AC current due to self-induction. This property is measured by the parameter called inductive reactance.

 

  • The inductive reactance is given by,

XL=2πfL

Here f is the frequency and L is the inductance.

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