The magnetic circuit of Figure consists of rings of magnetic material in a stack of height h. The rings have inner radius R_i and outer radius R₀. Assume that the iron is of infinite permeability (? = ?) and neglect the effects of magnetic leakage and fringing. For: R_i = 3.4 cm

R_o = 4.0 cm

h = 2cm

g = 0.2 cm

Calculate:

a. the mean core length l_c and the core cross-sectional area Ac.

b. the reluctance of the core R_c and that of the gap R_g. For N = 65 turns, calculate:

c. the inductance L.

d. current i required to operate at an air-gap flux density of B_g = 1.35T.

e. the corresponding flux linkages ? of the coil.

1199 +1 ort = 1 m. VI+0.05 B8 Core: mean length area A Xy N turns Plunger