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题目 原题及参考答案见 2 0 0 0年全国高考物理第 2 1题及答案 .笔者认为原参考解答中有错误之处 .分析 带电粒子从 S出发 ,在两筒之间的电场力作用下加速 ,沿径向穿出 a而进入磁场区 ,在洛伦兹力作用下做匀速圆周运动 .据左手定则判断 ,带电粒子在洛伦兹力作用下应向左偏转
For the original title and reference answers, please refer to the 2nd question and answer of the national college entrance examination in 2000. The author thinks that there are some errors in the original reference answer. Analyze the charged particles starting from S, under the action of the electric field between the two cylinders. Accelerate, pass through a in the radial direction and enter the magnetic field zone. Under the action of the Lorentz force, it makes a uniform circular motion. According to the left-hand rule, the charged particles should deflect to the left under the Lorentz force.