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如下图甲所示,在以O为坐标原点的xOy平面内,存在着范围足够大的电场和磁场.一个带正电小球在0时刻以v0=3gt0的初速度从O点沿+x方向(水平向右)射入该空间,在t0时刻该空间同时加上如下图乙所示的电场和磁场,其中电场沿+y方向(竖直向上),场强大小E0= mg q ,磁场垂直于xOy平面向外,磁感应强度大小B0= πm qt0 .已知小球的质量为m,带电量为q,时间单位t0,当地g,空气阻力不计.试求:
(1)12t0末小球速度的大小.(2)在给定的xOy坐标系中,大体画出小球在0到24t0内运动轨迹的示意图.(3)30t0内小球距x轴的最大距离.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAA5ElEQVRYR2NkGGDAOMD2M+B0wKpVq9huv/jbxPD/fxwDA4MkhQ59zsDIuEhVgrkuLCzsF7JZOB3QOml5B8P//+UUWoyqnZGxszovsoI4B0xc9gyfzxmZmb2rcsK3IRvWMWm599///7fgcfTz6vwoKWId8B+f75kZGX0q8iK3kugAhur8KJRQxx0FE5fhdQC5UTPqgNEQGA2B0RAYDYHREBgNgaETAuTW96TqG7yt4tbRFhGRIQBqHTP9+8dIoDUMTxqk5AK8zXKYiaDWMYhNpANIaJYPdMdkwLtmpOZnctUPeDkAAP6tmiH1ggTLAAAAAElFTkSuQmCC)
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参考答案:
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参考解析:
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