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如图所示，间距为L的两光滑平行金属导轨MN、PQ水平放置，导轨右端接有一阻值为R的电阻，导轨足够长．在垂直导轨的虚线cd右側存在一磁感应强度大小为B、方向垂直轨道平面竖直向上的匀强磁场．现将一长度为...
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高三下学期物理《》真题及答案
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如图所示通电螺线管置于水平放置的两根光滑平行金属导轨MN和PQ之间ab和cd是放在导轨上的两根金属棒
ab向左,cd向右
ab向右,cd向左
ab、cd都向右运动
ab、cd都不动
如图所示两条足够长的光滑平行金属导轨水平放置导轨上静止地放置两根质量相同电阻相同的导体棒MN和PQ两
最终两导体棒都做匀速直线运动
最终两导体棒都做匀加速直线运动
导体棒 MN 上的电流一直增大
导体棒 PQ 上的电流先不断增大后保持不变
如图所示光滑的金属导轨MNPQ水平放置它们之间的距离L=0.2m金属棒ab可沿导轨滑动导轨左端所接的
如图所示abcd为水平放置的平行形光滑金属导轨间距为l导轨间有垂直于导轨平面的匀强磁场磁感应强度大小
电路中感应电动势的大小为
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两根平行光滑金属导轨MN和PQ水平放置其间距为0.60m磁感应强度为0.50T的匀强磁场垂直轨道平面
如图所示两足够长的平行光滑的金属导轨MNPQ相距为L.＝1m导轨平面与水平面夹角α＝30°导轨电阻不
如图所示电阻不计的光滑平行金属导轨MN和OP水平放置MO间接有阻值为R.的电阻两导轨相距为L.其间有
如图8所示水平放置的平行金属导轨相距为d导轨一端与电源相连垂直于导轨平面的匀强磁场的磁感应强度为B方
如图所示两根平行光滑金属导轨PQ和MN间距为d它们与水平面间的夹角为α上端与阻值为R的电阻连接导轨上
如图所示通电螺线管置于水平放置的光滑平行金属导轨MN和PQ之间ab和cd是放在导轨上的两根金属棒它们
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如图所示平行金属板MNPQ水平放置通过如图所示的电路与电源连接小微粒A.从平行金属板的最左边两板正中
广东省汕头市2017高三第二次4月模拟如图a所示两条平行导轨固定在同一水平面内相距为L.在导轨之间右
如图所示两足够长平行光滑的金属导轨MNPQ相距为L.导轨平面与水平面夹角α＝30°导轨上端跨接一定值
如图所示在方向竖直向上的磁感应强度为B.特斯拉的匀强磁场中有两条光滑固定的平行金属导轨MNPQ导轨足
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如图所示通电螺线管置于水平放置的光滑平行金属导轨MN和PQ之间ab和cd是放在导轨上的两根金属棒它们
ab向左，cd向右
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ab、cd都向右运动
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20分如图所示两足够长平行光滑的金属导轨MNPQ相距为L.导轨平面与水平面夹角a=30°导轨电阻不计
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电路中感应电流的大小为
金属杆所受安培力的大小为
的发热功率为
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