089安培力作用下的运动 精讲精练-2022届高三物理一轮复习疑难突破微专题
089安培力作用下的运动一.必备知识1.方法概述判断通电导体在安培力作用下的运动或运动趋势,首先要弄清导体所在位置的磁场分布情况,然后利用左手定则判定导体的受力情况,进而确定导体的运动方向或运动趋势的方向。2.常用判断方法(1)电流元法:把整段弯曲导线分为多段直线电流元,先用左手定则判断每段电流元的受力方向,然后判断整段导线所受合力的方向,从而确定导线运动方向。(2)特殊位置法:通电导线转动到某个便于分析的特殊位置时,判断其所受安培力的方向,从而确定其运动方向。(3)等效法:环形电流可等效成小磁针,通电螺线管可以等效成条形磁体或多个环形电流。然后根据同极相斥、异极相吸判断相互作用情况。(4)结...
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