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5. An iron ring with a cross-sectional area of 3 cm2 and a mean circumference of 75 cm is wound with 250 turns wire carrying
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Flux = MMF A-3cm² Reluctance i-o- N = 250 Flux = Ni R = eller Mp 37500 lolla El 75x162 l = 211R = 75x162 m 1 49x107x7500x 3x1

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