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1关于磁场对通电直导线的作用力,下列说法中正确的是( )
A.通电直导线跟磁场方向平行时作用力最小,等于零
B.通电直导线跟磁场方向垂直时作用力最大
C.作用力的方向既垂直磁场方向,又垂直电流方向
D.通电直导线跟磁场方向不垂直时没有作用力
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2关于通电导线所受安培力F的方向,在下图所示的各图中不正确的是( )
A.![1582512175345645.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512175345645.jpg)
B.![1582512175114426.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512175114426.jpg)
C.![1582512175424655.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512175424655.jpg)
D.![1582512175380320.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512175380320.jpg)
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3如图所示,固定在水平绝缘平面上足够长的金属导轨不计电阻,但表面粗糙,导轨左端连接一个电阻R,质量为m的金属棒ab(电阻也不计)放在导轨上,并与导轨垂直,整个装置放在匀强磁场中,磁场方向与导轨平面垂直,用水平恒力F把ab棒从静止起向右拉动的过程中( )
![1582512175549272.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512175549272.jpg)
A.恒力F做的功等于电路产生的电能
B.恒力F和摩擦力的合力做的功等于电路中产生的电能
C.克服安培力做的功等于电路中产生的电能
D.恒力F和摩擦力的合力做的功等于电路中产生的电能和棒获得的动能之和
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4一通电细杆置于倾斜的导轨上,杆与导轨间有摩擦,当有电流时直杆恰好在导轨上静止。如图是它的四个侧视图,标出了四种可能的磁场方向,其中直杆与导轨间的摩擦力可能为零的是( )
A.![1582512175660556.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512175660556.jpg)
B.![1582512175357702.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512175357702.jpg)
C.![1582512175772885.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512175772885.jpg)
D.![1582512175617284.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512175617284.jpg)
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5如图所示,表示磁场对通电直导线的作用,其中正确的是( )
A.![1582512175867697.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512175867697.jpg)
B.![1582512175574937.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512175574937.jpg)
C.![1582512175387457.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512175387457.jpg)
D.![1582512175870124.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512175870124.jpg)
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6如图所示,金属框架处于与框架垂直的匀强磁场中,导体棒与框架接触良好且无摩擦,现用力F拉导体棒向右做匀加速运动,则力F的变化规律为图象中的( )
![1582512176995685.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512176995685.jpg)
A.![1582512176210735.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512176210735.jpg)
B.![1582512176127997.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512176127997.jpg)
C.![1582512176912551.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512176912551.jpg)
D.![1582512176961871.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512176961871.jpg)
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7在下列各图中,已标出了磁场B的方向、通电直导线中电流I的方向,以及通电直导线所受安培力F的方向,其中符合左手定则的是( )
A.![1582512176533538.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512176533538.jpg)
B.![1582512176710133.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512176710133.jpg)
C.![1582512176913249.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512176913249.jpg)
D.![1582512176621677.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512176621677.jpg)
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8以下各图画出了通电导线在磁场中所受磁场力F方向,导线中电流I方向以及磁场方向之间的关系,其中正确的是( )
A.![1582512176845888.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512176845888.jpg)
B.![1582512176806314.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512176806314.jpg)
C.![1582512176583236.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512176583236.jpg)
D.![1582512176347986.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512176347986.jpg)
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9在下列各图中,分别标出了磁场B的方向,电流I方向和导线所受安培力F的方向,其中正确的是( )
A.![1582512176479367.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512176479367.jpg)
B.![1582512176871674.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512176871674.jpg)
C.![1582512176546146.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512176546146.jpg)
D.![1582512176227718.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20200224/1582512176227718.jpg)
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10匀强磁场的磁感应强度为0.5T,通电直导线与磁场方向垂直,导线长度为0.2m,导线中电流为2A。该导线所受安培力的大小是( )
A.0.1N
B.0.2N
C.0.3N
D.0.4N
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