A ring having a cross-sectional area of 500 mm2, a circumference of 40 – McqOptions

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1.	A ring having a cross-sectional area of 500 mm2, a circumference of 400 mm and ?=800microWb has a coil of 200 turns wound around it. Relative permeability of ring is 380. Calculate the reluctance.
A.	1.68 * 10-4A/Wb
B.	1.68 * 104 A/Wb
C.	1.68 * 106 A/Wb
D.	1.68 * 10-6A/Wb
Answer» D. 1.68 * 10-6A/Wb

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