32. A conducting circular loop is placed in a uniform magnetic field of 0.04 T with its plane endicular to the magnetic field. The radius of the loop starts shrinking at 2 mm/s. emf in the loop when the radius is 2 cm is
(A) 0.8π μV
(B) 1.2π μV
(C) 1.6π μV
(D) 2.4π μV
(E) 3.2π μV
答案：E
統計：A:1,B:0,C:0,D:0,E:0
難度：計算中