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原题如图1所示,两条相距l的光滑平行金属导轨位于同一水平面(纸面)内,其左端接一阻值为R的电阻;一与导轨垂直的金属棒置于两导轨上;在电阻、导轨和金属棒中间有一面积为S的区域,区域中存在垂直于纸面向里的均匀磁场,磁感应强度大小B_1随时间t的变化关系为B_1=kt,式中k为常量;在金属棒右侧还有一匀强磁场区域,区域左边界MN(虚线)与导轨垂直,磁场的磁感应强度大小为B_0,方向也垂直
The original title is shown in Figure 1, the two parallel l parallel metal rails are located in the same horizontal plane (paper), the left end of a resistor connected to a resistance R; a metal bar perpendicular to the rail placed on the two rails; In the middle of the resistance, the guide rail and the metal bar, there is an area of area S, and there is a uniform magnetic field perpendicular to the paper surface in the area. The change of the magnetic induction intensity B_1 with time t is B_1 = kt, where k is a constant; The right side of the bar there is a uniform magnetic field region, the regional left border MN (dashed line) perpendicular to the guide rail, the magnetic induction of the magnetic field size B_0, the direction is also vertical