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2013年福建高考物理压轴题,评卷结果显示全省约300名左右的考生全对,由此可以看出难度很大。尤其是第(3)小题,很多同学感到一头雾水、无从下手。下面简要介绍、比较针对该小题的两种解题方法。原题:如图甲,空间存在—范围足够大的垂直于xoy平面向外的匀强磁场,磁感应强度大小为B。让质量为m,电量为q(q<0)的粒子从坐标原点O沿加xoy平面以不同的初速度大小和方向入
2013 Fujian college entrance exam physics finale, the results of the examination showed that about 300 candidates in the province all right, we can see that very difficult. In particular, (3) a small topic, many students feel confused, unable to start. The following is a brief introduction to compare two solutions to the problem. The original topic: Figure A, space exists - a large enough range perpendicular to the xoy plane out of the uniform magnetic field, the size of the magnetic induction B. Let the mass m, q (q <0) of the particles from the coordinate origin O along the xoy plane at different initial velocity and size of the direction into