Now suppose an air gap 0.1 mm long is cut in the right leg of the core of Figure 11.2.1(a), making the magnetic circuit look like that of Figure 11.2.1(b). Neglect leakage and fringing. With the new core configuration, repeat Problem 11.2.1 for the same dimensions and values given in that problem. See what a difference that small air gap can make!
Consider the magnetic circuit of Figure 11.2.1(a). Let the cross-sectional area AC of the core, be 16 cm2 , the average length of the magnetic path in the core lC be 40 cm, the number of turns N of the excitation coil be 100 turns, and the relative permeability µr of the core be 50,000. For a magnetic flux density of 1.5 T in the core, determine:
(a) The flux φ
(b) Total flux linkage λ(= Nφ).
(c) The current required through the coil.
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