I am to draw an impedance diagram of a low pass filter and indicate the
phase angle.
Is the phase angle found by:
1) -arctan(wRC)
or
2) -arctan(Xc/R)
Appreciate if someone could advise which one of the above is correct.

TIA

TIA

TIA

A proper answer requires more information about the filter than "low pass". For one thing, phase is a relative measure. You must describe what your reference is and where you want the angle. A drawing would help.

Jerry

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BIGEYE wrote:

Presuming a RC ladder section Item 1 is correct if you drop i in w; so w=2***pi***f
I presume that this is homework. You need to walk through the formulas
and diagrams. This answer is right for this case, but the problem will
occur again and you need to understand the fundamentals.
Consider the divider formula Xc/(Xc+R) then 1/(1+R/Xc)
compute the phase angle.
Then draw the complex plane figures and see how you get the same
answer.
At some point the "meaning" will come through.
It's there just look a little.

RRogers

Presuming a RC ladder section Item 1 is correct if you drop i in w; so w=2

RRogers

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