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题目:如图1所示,在水平方向,与纸面垂直的足够大的匀强磁场中,有一足够长的矩形金属框架abcd,以v_1=2m/s的水平速度向右做切割磁感线运动,从而在框架上、下两板间产生一个匀强电场.有一个带电油滴以水平速度v_2从ad的中点P(ap=L/2)向
Title: As shown in Figure 1, in the horizontal direction, a sufficiently large uniform magnetic field perpendicular to the plane of the paper has a long enough rectangular metal frame abcd to cut the magnetic induction line to the right at a horizontal speed of v_1 = 2 m / s So that a uniform strong electric field is generated between the two plates in the frame and there is a charged oil droplet traveling from the midpoint P (ap = L / 2) of ad to the horizontal velocity v_2