試題詳解

36.A square loop (L = 0.20 m) consists of 50 closely wrapped turns, each carrying a current of 0.50 A. The loop is oriented as shown in a uniform magnetic field of 0.40 T directed in the positive y direction. What is the magnitude of the torque on the loop?

(A) 0.15 N · m
(B) 0.35 N · m
(C) 0.55 N · m
(D) 0.75 N · m
(E) 1.73 N · m