1. The problem statement, all variables and given/known data An inductor is connected to a 20.0-Hz sinusoidal power supply that produces a 50.0-V peak voltage. What inductance is needed to keep the instantaneous current in the circuit below 77.4 mA? 2. Relevant equations X(L)min = V(rms)/I(rms) I(rms) = I(max)/√2 X(L) = 2pi*f*L 3. The attempt at a solution I(rms) = 77.4E-3 A / sqrt(2) = 0.0547300649 A X(L)min = 50 V / 0.0547300649 A = 913.5746527 ohms L = X(L)/(2pi*f) = 913.5746527 ohms / 2 / pi / 20 Hz = 7.27 Henry But the answer is actually 5.14 Henry and I can't figure out why. Where did I go wrong?