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A radio frequency choke is air-cored whe...

A radio frequency choke is air-cored whereas an audio frequency choke is iron cored. Why ?

Text Solution

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Inductive reactance of a coil of inductance L is
`X_(L) = omega L = 2 pi v L`
Radio frequency is high. To maintain `X_(L)` low, inductance L should have a small value. This is obtained using air cored choke.
Audio frequency is low. To maintain particular value of `X_(L)`, inductance L has to be high. For this, iron core with large permeability `(mu)` is requied.
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