Electronics - Inductors - Discussion


A series RL filter circuit with an output across the inductor will result in what type of filtering?

[A]. passing of the higher frequencies
[B]. passing of the lower frequencies
[C]. blocking of the higher frequencies
[D]. blocking of a certain range of frequencies

Answer: Option A


No answer description available for this question.

Prasanna said: (Aug 20, 2012)  
If the output is taken across the inductor, high frequencies are passed and low frequencies are attenuated (rejected). Thus, the circuit behaves as a high-pass filter. If, though, the output is taken across the resistor, high frequencies are rejected and low frequencies are passed. In this configuration, the circuit behaves as a low-pass filter. Compare this with the behaviour of the resistor output in an RC circuit, where the reverse is the case.

Sivapramod said: (Jan 19, 2013)  
Look at the construction of a pi filter which has a inductor series connected and act as a low pass filter. So here the answer it low pass filter.

Craig said: (Aug 22, 2013)  
I always have to figure these out from basics. If you can remember that the impedance of an inductor is given by Z = j*2π*f*L, then it's reasonably easy to figure out if you then treat the system like a voltage divider.

If the output is taken over the inductor then as frequency increases the output taken across it will also increase.

Sivapramod said: (Jan 28, 2014)  
The circuit act as a low pass filter because of inductor serially connected.

Rahul said: (Apr 15, 2017)  
Inductor Connected in series just like a low pass filter. Because for high-frequency XL is very large.

Deepika said: (Apr 22, 2020)  
High pass filter.

Simply remind R-C (output) ----LPF.
L-R (OUTPUT) ---LPF and vice versa.

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