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2. The magnetic circuit of Fig. 1 consists of rings of magnetic material in a stack of height h. The rings have inner radius Ri and outer radius Ro. Assume that the iron is of infinite permeability (μ → x) and neglect the effects of magnetic leakage and fringing Ri N turns For Ri-3.2 cm, Roー4.1 cm, ћ-1.8 cm, g = 0.15 cm, N-72 turns, calculate a. The mean core length le and the core corss-sectional area Ac. b. The reluctance of the core Rc and that of the gap Rg c. The inductance L d. Current i required to operate at an air-gap flux density of B 1.25 T. e. The corresponding flux linkage λ of the coil. Figure 1: Problem 2

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