問題詳情

15. There is a doughnut-shaped toroidal solenoid with 200 turns of wires carrying current 0.02A. The inner radius of that is 1 m andouter radius is 5 m. What is the magnetic fieldof this doughnut-shaped toroidal solenoid at the point with distance 0.5 m fromcenter of that? ( μ0 is permeability constant ) 5eeadf55bcc1b.jpg
(A) 0
(B) 4 μ0/π
(C) 2 μ0/π
(D) μ0/2π
(E) μ0/4π



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