097洛伦兹力随速度变化的运动 精讲精练-2022届高三物理一轮复习疑难突破微专题
097洛伦兹力随速度变化的运动一.必备知识1.洛伦兹力公式F=qvB,可见,该力与速度有直接关联。2.带电体在叠加场中受轻杆、轻绳、圆环、轨道等约束的情况下,常见的运动形式有直线运动和圆周运动,此时解题要通过受力分析明确变力、恒力做功情况,并注意洛伦兹力不做功的特点,运用动能定理、能量守恒定律结合牛顿运动定律求出结果。二.典型例题题型一:洛伦兹力随速度均匀变化1(多选)如图所示,两个倾角分别为30°和60°的足够长光滑绝缘斜面固定于水平地面上,并处于方向垂直纸面向里、磁感应强度为B的匀强磁场中,两个质量为m、电荷量为+q的小滑块甲和乙分别从两个斜面顶端由静止释放,运动一段时间后,两小滑块都将飞...
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