2. Design a cascading LC low-pass Butterworth filter that has magnitude ratio flat to within 3dB at 70 Hz but with an attenuation of at least 30DB for all frequencies

stand above 175 Hz. Assume that R, = RL = 502. Determine the number of stages needed in the filter and the values of L's and C's in physical units (The normalized LC values for each stage are listed in a table on page 6).