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1.简化运算过程例1如图1所示,顶角a =45°的光滑金属导轨MON固定在水平面内,导轨处在方向竖直向下、磁感应强度为B的匀强磁场中.一根与ON垂直的导体棒在水平外力作用下以恒定速度v_0沿导轨MON向左滑动,导体棒的质量为m,导轨与导体棒单位长度的电阻均匀为r.导体棒与轨接触点为a和b,导体棒在滑动过程中始终保持与导轨良好接触.t=0时,导体棒位
1. Simplified calculation process Example 1 As shown in Figure 1, the smooth metal rail MON with the apex angle a = 45° is fixed in the horizontal plane, and the guide rail is in a uniform magnetic field with a vertical direction down and magnetic induction intensity B. The conductor bar perpendicular to ON is slid to the left along the guide rail MON with a constant velocity v_0 under the action of a horizontal external force. The mass of the conductor bar is m, and the resistance per unit length of the guide rail and the conductor bar is equal to r. The contact point between the conductor bar and the rail is a and b. The conductor rod always keeps good contact with the guide rail during the sliding process. When t=0, the conductor rod position