Hello all, I'm not quite sure if this is a physics question or an EE question because it came up in an electronics design course for physicists with mostly engineering motivation, anyways here goes: I have an RLC band pass filter with a sinusoidal AC voltage input (Agilent function generator). I am measuring the input voltage with an oscilloscope but it is measuring at around 768mV and not at 1V; the input voltage is attenuated by about a third. Is this being caused by a back EMF produced by the inductor? I'll try and make a diagram below to show what kind of filter it is: Code (Text): --------- L ------- Vin----R------|......................|----------Vout ----------C------- Basically the capacitor and inductor are in parallel with each other and actually go to ground. The scope is measuring at Vin, R = 100 ohms, L = 100 microHenries, C = 1 microFarad, What I am thinking is that the apparent droop that I am seeing on the scope is caused by a back EMF from the inductor, is this what is really happening? I am interested in knowing the true cause!