試題詳解

47. A segment of wire of total length 2.0 m is formed into a circular loop having 5.0 turns. If the wire carries a 1.2-A current, determine the magnitude of the magnetic field at the center of the loop. (μ₀ = 4π• 10^-7 T∙m/A)
(A) 59 μT
(B) 69 μT
(C) 79 μT
(D) 89 μT
(E) 94 μT