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4. [15] An RC circuit is excited with a fixed frequency signal. The excitation signal and the response are measured with an oscilloscope. The time traces are shown in the

plot below.Note that any DC offsets of the signals may be ignored. Calculate the following: a. The frequency of the excitation signal, b. The magnitude (gain) of the frequency response, and c. The phase of the frequency response.

Fig: 1

Fig: 2