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题目.(2011年江苏高考卷第15题)某种加速器的理想模型如图1所示,两块相距很近的平行小极板中间各开有一小孔a、b,两极板间电压Uab的变化图像如图2所示,电压的最大值为U0、周期为T0,在两极板外有垂直纸面向里的匀强磁场.若将一质量为m0、电荷量为q的带正电的粒子从板内a孔处静止释放,经电场加速后进入磁场,在磁场中运行时间T0后恰能再次从a孔进入电场加速.现
(2011 Jiangsu Entrance Examination Question 15) an accelerator model as shown in Figure 1, two very close to the middle of parallel small plates have a small hole a, b, the voltage between the two plates Uab Change the image shown in Figure 2, the maximum voltage U0, the cycle T0, in the vertical plane perpendicular to the plate outside of a strong magnetic field.If a mass of m0, the charge amount q of positively charged particles Static release from a hole at the plate, accelerated by the electric field into the magnetic field, after running time T0 in the magnetic field just once again from a hole into the electric field to accelerate.