問題詳情

43.tOne quarter of a circular loop of wire carries a current I. The current I enters and leaves on straight segments of wire. The straight wires are along tiie radial direction ftom the center of the circular portion, Find the magnetic field at the center of tiie circular.
(A)


(B)

t
(C)


(D)


(E)

參考答案

答案：C

統計：A:0,B:0,C:1,D:0,E:0

難度：計算中