555555555522. What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it? (a) 18.75 At (b) 30 At (c) 300 At (d) 187 At
555555555517. What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current? (a) 2,400 At (b) 240 At (c) 24 At (d) 2.4 At
5555555555 18. What is the flux density when the flux is 5.5 μWb and the cross-sectional area is 6 × 10–3 m2? (a) 91.7 μT (b) 917 μT (c) 91 T (d) 9.7 T