I have this filter problem,(adsbygoogle = window.adsbygoogle || []).push({});

I am given a magnitude graph (magnitude vs frequency, with a point on it) of voltage across input current source and a sketch of a circuit: black box connected with a current source (cos(wt) and voltage across it is Vmcos(wt + theta)) and the question is to figure out what's in the box and values. Looking at the graph, it is low-pass filter

So far we covered steady-state sinusoidal response and phasors. But all the examples in the book are with voltage sources so I am thrown off, I am not sure if I can do source transformation on it!

So, I tried getting ratio of v/i and using phasor e-notation, I got Vm*e^theta, so does that mean that since impedance has positive imaginary part, it's inductor and resistor in series? What would a point on the magnitude voltage graph give me?

Any hint on this would be GREATLY appreciated...

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Filter problem

**Physics Forums | Science Articles, Homework Help, Discussion**