A.Dr. Turner often gives quizzes. B.She didn't expect to have a quiz today. C.She doesn't know anything about the quiz either. D.She didn't know Dr. Turners lecture would be so interesting.
【简答题】【安培力】 一平面试验线圈的磁矩大小 p m 为 1×10 -8 A·m 2 ,把它放入待测磁场中的 A 处,试验线圈如此之小,以致可以认为它所占据的空间内场是均匀的。当此线圈的 p m 与 z 轴平行时,所受磁力矩大小为 M =5×10 -9 N·m ,方向沿 x 轴负方向;当此线圈的 p m 与 y 轴平行时,所受磁力矩为零。则空间 A 点处的磁感强度 的大小为 ____________T ,...