The magnetic Frame shown is built up of iron of square cross-section, 3cm side. Each air gap is 2mm wide. Each of the coil is wound with 1000 turns and exciting current is 1.0 A. The relative permeability part A and part B may be taken as 1000 and 1200 respectively. Calculate the flux set-up in the circuit. -Part-A 3 cm 2 mm K Part-B 20 cm 10 cm-

Question 1 Select all that apply. Which of the following are considered to be "core losses"? 12R heating loss Flux lines that bulge out at core gaps Currents that circulate within the machine non-ferrous components Field Lines that circulate around conductors and coils Rapid Changes in Domain orientation

Look carefully at the figure and answer the following questions. For your answers choose between on the right, on the left and it is zero; there are no more options. (a) When the switch is “open” i. Where does the current flow in the battery? ii. Where is the magnetic flux going in the bar on the left? iii. Where does the magnetic flux go in the bar on the right? iv. Where does the current flow in the resistor?

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