A ring having a cross-sectional area of 500 mm^2, a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Relative permeability of ring is 380. Calculate the magnetomotive force.(a) 1442At(b) 1342At(c) 1432At(d) 1344AtI have been asked this question in unit test.This is a very interesting question from Ohm’s Law for a Magnetic Circuit topic in division Simple Magnetic Circuits of Basic Electrical Engineering

A ring having a cross-sectional area of 500 mm^2, a circumference of 4

1.	A ring having a cross-sectional area of 500 mm^2, a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Relative permeability of ring is 380. Calculate the magnetomotive force.(a) 1442At(b) 1342At(c) 1432At(d) 1344AtI have been asked this question in unit test.This is a very interesting question from Ohm’s Law for a Magnetic Circuit topic in division Simple Magnetic Circuits of Basic Electrical Engineering
Answer» Right answer is (d) 1344At To explain: Reluctance=L/(µA) = l/(µrµ0A) SUBSTITUTING the values, we GET Reluctance S=1.68*106 A/Wb. F=ϕS Substituting the given values, we get F = 1344At.

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