Since the decreasing amplitude of the voltage terms and the increasing magnitude of the
impedance both contribute to diminishing ac currents as n increases, the peak-to-peak
current variation will be estimated from the first ac term. For n 6, Vn/Vm is estimated
from Fig. 4-21 as 0.28, making V6 0.28(4160 ) 1650 V. The peak-to-peak variation
of 10 percent corresponds to a zero-to-peak amplitude of (0.05)(95.5) 4.8 A. The
required load impedance for n 6 is then