题目.(2011江苏高考物理试题第5题)如图1所示,水平面内有一平行金属导轨,导轨光滑且电阻不计.匀强磁场与导轨平面垂直.阻值为R的导体棒垂直于导轨静止放置,且与导轨接触良好.t=0时,将开关S由1掷到2.q、i、v和a分别表示电容器所带的电荷量、棒中的电流、棒的速度和加速度.图2中图像正确的是 (2011 Jiangsu Entrance Examination Physics Question No. 5) shown in Figure 1, the horizontal plane has a parallel metal guide, the guide is smooth and the resistance is not uniform. Strong magnetic field perpendicular to the plane guide R resistance of the conductor bar perpendicular to the rail static Placed, and in good contact with the rail, t = 0, the switch S from 1 to 2.q, i, v and a, respectively, the amount of charge brought by the capacitor, the rod current, rod speed and acceleration. 2 image is correct