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A ring having a cross-sectional area of 500 mm2, 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 ring having a cross-sectional area of 500 mm2, 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. Correct Answer 1344At

Reluctance=l/(µ*A) = l/(µrµ0*A) 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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