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【单选题】
(2391) 一电子以速 度 垂直地进入磁感强度为 的均匀磁场中,此电子在磁场中运动轨道所围的面积内的磁通量将
A.
正比于 B ，反比于 ．
B.
反比于 B ，正比于 ．
C.
正比于 B ，反比于 v ．
D.
反比于 B ，反比于 v ．
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