105电磁感应中的双杆模型 精讲精练-2022届高三物理一轮复习疑难突破微专题
105电磁感应中的双杆模型一.必备知识双杆模型1.模型特点(1)一杆切割时,分析同单杆类似。(2)两杆同时切割时,回路中的感应电动势由两杆共同决定,E==Bl(v1-v2)。2.电磁感应中的“双杆”问题分析(1)初速度不为零,不受其他水平外力的作用光滑的平行导轨光滑不等距导轨示意图质量m1=m2电阻r1=r2长度l1=l2质量m1=m2不电阻r1=r2长度l1=2l2运动分析杆MN做变减速运动,杆PQ做变加速运动,稳定时,两杆的加速度均为零,以相等的速度匀速运动稳定时,两杆的加速度均为零,两杆的速度之比为1∶2能量分析一部分动能转化为内能,Q=-ΔEk(2)初速度为零,一杆受到恒定水平外力的作...
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