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某段通有恒定电流的直导线,置于某一匀强磁场中,关于该导线所受安培力的说法,正确的是( )
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高三上学期物理《》真题及答案
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直导线AB长为L水平放置在匀强磁场中磁场方向如图所示磁感应强度为B导线中通有恒定电流电流强度为I则
导线所受安培力大小为BIL
导线所受安培力大小0
若电流方向由B向A,则安培力方向竖直向上
若使导线在纸面内转过α角,则不受安培力
一根长为0.20m的直导线垂直于某匀强磁场方向放置当导线中通有1A的电流时导线受到的安培力大小为0.
长为0.2m的直导线通有0.4A的稳恒电流该导线处于磁感应强度为1.0T的匀强磁场中该通电直导线所受
如图所示质量为m的型导线框abcd其质量均匀分布ab与cd长度均为l宽度bc为s导线框置于竖直向上的
在甲乙两条直导线所在平面内—带电粒子的运动轨迹如图所示已知两条导线甲乙中只有一条导线中通有电流另一条
甲中通有自上而下的不断增大的电流,带负电的粒子从a 点向b 点运动
甲中通有自上而下的恒定电流,带正电的粒子从b 点向a 点运动
乙中通有自下而上的不断减小的电流,带正电的粒子从b 点向a 点运动
乙中通有自下而上的恒定电流带负电的粒子从a 点向b 点运动
在MN两条长直导线所在平面内一带电粒子的运动轨迹如图3中虚线所示已知两导线中只有一条通有恒定电流另一
M中通有自上而下的恒定电流,带负电的粒子从a点向b点运动
M中通有自上而下的恒定电流,带正电的粒子从b点向a点运动
N中通有自上而下的恒定电流,带正电的粒子从b点向a点运动
N中通有自上而下的恒定电流,带负电的粒子从a点向b点运动
处于纸面内的一段直导线长L.=1m通有I.=1
的恒定电流,方向如图所示.将导线放在匀强磁场中,它受到垂直于纸面向外的大小为F.=1N.的磁场力作用.据此( ) A.能确定磁感应强度的大小和方向
能确定磁感应强度的方向,不能确定它的大小
能确定磁感应强度的大小,不能确定它的方向
磁感应强度的大小和方向都不能确定
8分如图所示质量为m=50g长l=10cm的铜棒用长度相等的两根轻软导线悬吊在竖直向上的匀强磁场中导
如图所示3个在同一平面内磁感线的图形中的哪一个最接近于1通有恒定电流的长直螺线管内的中央区的磁场2通
如图所示质量为m的U.型导线框abcd其质量均匀分布ab与cd长度均为l宽度bc为s导线框置于竖直向
下列叙述正确的是
安培根据通电螺线管的磁场和条形磁铁的磁场的相似性,提出了分子电流假说
感应电流遵从楞次定律所描述的方向,这是能量守恒定律的必然结果
奥斯特在实验中观察到电流的磁效应,该效应揭示了电和磁之间存在联系
法拉第在实验中观察到,在通有恒定电流的静止导线附近的固定线圈中,会出现感应电流
在匀强磁场中某一通电导线与磁场方向垂直导线长L=0.2m导线中电流I=1A其所受到的安培力F.=0.
一根长2m的直导线通有1A的电流把它放在B.=0.2T的匀强磁场中并与磁场方向垂直导线所受的安培力是
一根载有恒定电流的长直导线穿过载有恒定电流的金属圆环中心且垂直于环面导线和环中的电流方向如图A-5所
一根通有恒定电流的直铜棒MN用软导线挂在方向垂直纸面向内的身强磁场中如图所示.此时悬线中的张力大于零
不改变电流方向,适当增大电流强度
使电流方向相反,适当减小电流强度
不改变电流方向,适当增大磁感强度
使电流方向相反,适当减小磁感强度
如图11所示M.N.为两条沿竖直方向放置的直导线其中有一条导线中通有恒定电流另一条导线中无电流一带电
M.中通有自上而下的恒定电流,带负电的粒子从a点向b点运动
M.中通有自上而下的恒定电流,带正电的粒子从a点向b点运动
N.中通有自上而下的恒定电流,带正电的粒子从a点向b点运动
N.中通有自上而下的恒定电流,带负电的粒子从a点向b点运动
一段直导线长为lm其中通有1A的恒定电流由于它处于匀强磁场中因而受到垂直于纸面向外的大小为lN.的磁
)磁感应强度的大小及方向都可以确定 (
)磁感应强度的大小可以确定而方向不能确定 (
)若再给出磁感应强度的大小,就能确定磁场的方向 (
)若再给出磁场的方向,就能确定磁感应强度的大小
如图所示通有恒定电流的直导线下边有一个矩形线框线框平面与直导线共面.若使线框逐渐向下远离平动通电导线
逐渐增大
逐渐减小
保持不变
不能确定
我们把磁场强弱和方向处处相同的磁场称为匀强磁场小明猜想通电导线在磁场中的受力大小与磁场强弱电流大小和
若两段导线的长度相等通过的电流大小相等则它们在某一匀强磁场中所受的磁场力也处处相等
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