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...

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# Filter problem

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