56. R = (VR / VL ) (wL) = 400 ohm
Vinput = sqrt( VR2 + VL2 ) = 50 V
57.
RL = (VDC - I2 R) / I2 = 6 ohm
sqrt( -RL2 I12 + VAC2) L = --------------------- = 36 mHenry w I1