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19. What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m2, and a permeability of 4,500 μWb/At × m?
(a) 1111 At/Wb
(b) 111 At/Wb
(c) 11 At/Wb
(d) 1 At/Wb
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