(a) A certain magnetic circuit consisting of three parts, A, B and C in series. Part A has a length of 200 mm and a cross-sectional area of 400 mm². Part B has a length of 300 mm and a cross-sectional area of 300 mm². Part C is an airgap 1 mm in length and of cross-sectional area 350 mm². The magnetic characteristic for parts A and B is given by: H (A/m) B (T) (b) 400 0.7 500 0.8 630 0.9 800 1.0 Neglecting magnetic leakage and fringing. (i) Sketch the magnetic equivalent circuit for the system. (ii) Determine the m.m.f. necessary to produce a flux of 0.3 mWb in the airgap. 1100 1.1 (iii) Calculate the current required to produce the m.m.f. in Q.1(a)(ii) if N is 100. (iv) Given that the maximum flux density, Bmax for the material is 1.15 T. Estimate the flux density of magnetic material in part A and B when the current in Q.1(a)(iii) is tripled. (v) Suggest a method to avoid condition in Q.1(a)(iv). A ferromagnetic ring of cross-sectional 700 mm² and of mean radius 150 mm has two windings connected in series, one of 500 turns and another is 1000 turns. If the relative permeability is 1000, Calculate the self-inductance of each coil and the mutual inductance, assuming that there is no flux leakage. State two applications of mutual inductance.

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You have a solenoid with an into all current of 577A and a turn dentistry of 6601 loops/m What is the intial magnetic field through the solenoid ? the current in the solenoid drops to 34 A over the course of 4ms. What is the final magetic field through the solenoid ? the coil has a resistance of 20. What is the current though the coil? what is the power disssipated by the coil? inside the solenoid 56loops and a radius of 6.2cm. What is the magnitude of the induced in the 56 turn coil. Positive nunber