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[题1] 如图1所示,匀强磁场方向垂直于纸面向里,磁感应强度B=1特,匀强电场方向水平向右,电场强度E=10(3~(1/2))牛/库。有一个带正电的微粒m=2×10~(-(?))千克,q=2×10~(-(?))库,在纸平面内作匀速直线运动(g取10米/秒~2)。 1.求带电微粒的运动方向和速度大小。 2.若带电微粒运动到某一与电力线平行的直线上的P点时,突然撤去磁场,经过时间t后微粒运动到同一直线上的Q点,那么t为多少?
[Item 1] As shown in Figure 1, the direction of the uniform magnetic field is perpendicular to the surface of the paper, the magnetic induction intensity B is 1 tex, the direction of the uniform electric field is rightward, and the electric field intensity is E=10 (3 to 1/2). / Library. There is a positively charged particle m = 2 × 10 ~ (-(?)) kg, q = 2 × 10 ~ (-(?)) library, in the paper plane for uniform linear motion (g take 10 meters / second ~2). 1. Find the moving direction and speed of charged particles. 2. If the charged particles move to point P on a straight line parallel to the power line, the magnetic field is abruptly removed. After the time t, the particles move to point Q on the same line. What is t?