where ℜm is the reluctance of the magnetic path in iron, ℜg the reluctance in the gap, lm is the length of the magnetic
path in iron, lg is the length of the gap, and μr is the relative permeability of iron. The emf in the loop is calculated
from Eq. (10.29) using ω2 ¼ 2π 60 ¼ 120π rad/s and ω1 ¼ 2π 3,600/60 ¼ 2π 60 ¼ 120π rad/s, but the
number of turns in the loop is Nloop ¼ 1: