两根平行的长金属棒,相距为 L ,其上放置一与其摩擦可忽略的光滑金属棒 ab ,二长金属棒一端接上电动势为 ε ,内阻为 r 的电源,整个装置放于区域足够大的匀强磁场 B 中, B 的图示。忽略各金属棒的电阻,则 ab 运动速度将: A. 无限大; B.最后为零; C. 最后保持 v = εL/r ; D.最终保持 v = ε/BL 。
A.
A
B.
B
C.
C
D.
D
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