Taiwan Electrical Engineering Technologist Examination

Practice session

A magnetic core has a cross-sectional area A_c = 20.0 cm^2 (2.0 * 10^-3 m^2), mean core flux path length l_c = 0.50 m, relative permeability mu_r = 2000, and an air gap of length l_g = 1.0 mm (1.0 * 10^-3 m). An excitation coil of N = 500 turns carries a current I = 2.0 A. Neglecting fringing flux at the air gap and magnetic leakage, what is the total magnetic flux Phi in the core?

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