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题目.如图1,水平面内有一光滑金属导轨,其MN、PQ边的电阻不计,MP边的电阻阻值R=1.5Ω,MN与MP的夹角为135°,PQ与MP垂直,MP边长度小于1m.将质量m=2kg,电阻不计的足够长直导体棒搁在导轨上,并与MP平行.棒与MN、PQ交点G、H间的距离L=4m.空间存在垂直于导轨平面的匀强磁场,磁感应强度B=0.5T.在外力作用下,棒由GH处以一定的初速度向左做直线运动,运动时回路中的电流强度始终与初始时的电流强度相等.(1)若初速度v1=3m/s,求棒在GH处所受的安培力大小FA;(2)若初速度v2=1.5m/s,求棒向左移动距
Title, as shown in Figure 1, the horizontal plane has a smooth metal guide, the resistance of the MN, PQ edge excluding the edge resistance of MP edge resistance R = 1.5Ω, MN and MP angle of 135 °, PQ and MP vertical MP edge Length less than 1m. The mass m = 2kg, resistance long enough straight conductor rod resting on the rail and parallel with the MP rod and MN, PQ intersection G, H distance L = 4m. Space exists perpendicular to the rail plane Magnetic flux density B = 0.5 T. Under the action of external force, the rod moves linearly from left to right at a certain initial velocity, and the current intensity in the circuit during movement is always equal to the initial current intensity. (1) If the initial velocity v1 = 3m / s, find the rod in the GH by the force of the size of FA; (2) If the initial velocity v2 = 1.5m / s, find the rod to move to the left