For the magnetic system given below, assume infinite permeability for the core. * 1=0.5 A 6 cm- N=1000 turns Core cross-section: 2 cm x 2 cm 6 cm- 0.5 cm 8 cm

There is 50 mA of current through a coil with 250 turns. The flux is 150 µWb. What is the mmf? What is the reluctance of the circuit?     A. Fm = 1.25 At   -   R=4.3x10-3 At/Wb   B. Fm = 2.25 At   -   R=8.3x10-3 At/Wb   C. Fm = 1.25 At   -   R=8.3x10-3 At/Wb   D. Fm = 1.25 At   -   R=8.3x10-2 At/Wb

Problem 2: Consider the magnetic core shown in figure P-2 and notice that three sides of the core are of uniform width, whereas the forth side is somewhat thinner. The depth of the core into the page is 10 cm. The coil has 300 turns and the relative permeability of the core is 2500. Determine the current that will produce 50 mWeb flux in the core. I 10cm 20cm Figure P-2 ★ 5cm T 10cm 20cm 10cm

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In a Curie-type paramagnet, all the ions with magnetic moments contribute to the total susceptibility, but in a metal, only very few of the free electrons contribute to Pauli paramagnetism. Why?

5. A cast-iron core of the shape indicated below has the following pertinent dimensions: ab = 10 cm and bc = 15 cm. Find the mmf required if the magnetic field intensity in the thinner side is H1= 100 A-turns/m and the thicker side is H2 = 46 A-turns/m. b 2011

Calculate the flux (mWb) in a rectangular core that is 8.0 mm by 7 mm if the flux density is 4.0 Tesla?