如图甲所示,光滑导轨水平放置在与水平方向夹角斜向下的匀强磁场

如图甲所示,光滑导轨水平放置在与水平方向夹角斜向下的匀强磁场中,匀强磁场的磁感应强度B随时间的变化规律如图乙所示(规定斜向下为正方向),导体棒ab垂直导轨放置,除电阻R的阻值外,其余电阻不计,导体棒ab在水平外力作用下始终处于静止状态。规定a→b的方向为电流的正方向,水平向右的方向为外力的正方向,则在0~t时间内,能正确反映流过导体棒ab的电流  

 

 

答案

D

解析:略

 

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