如图所示,直导体棒放在倾斜的导轨上,当导体棒通以垂直于纸面向里

如图所示,直导体棒放在倾斜的导轨上,当导体棒通以垂直于纸面向里的电流时,恰能在导轨上静止.下列情况中,棒与导轨间的摩擦力可能为零的是(　　　　　)

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如图所示,直导体棒放在倾斜的导轨上,当导体棒通以垂直于纸面向里

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