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如图所示,一质量为m,带电量为q的微粒,从两平行金属板正中央沿与匀强电场垂直方向...
如图所示,一质量为m,带电量为q的微粒,从两平行金属板正中央沿与匀强电场垂直方向射入,不计重力,当入射速度为v时,它恰好穿过电场而不碰金属板,现使微粒入射速度为
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,仍恰好穿过电场,保持其他量不变时,可行的方法是( )
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A.使粒子带电荷量为原来的
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倍
B.使两板间电压减为原来的
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倍
C.使两板间距离增为原来的2倍
D.使两板间距离增为原来的
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倍
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如图所示,有一匀强电场,其场强为E,方向水平向右,把一个半径为r的光滑绝缘环,竖直放置于场中,环面平行于电场线,环的顶点A穿有一个质量为m,电量为q(q>0)的空心小球,当小球由静止开始从A点下滑
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圆周到B点时,小球对环的压力大小为( )
A.2mg+3qE
B.3qE
C.2mg+qE
D.2mg+2qE
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如图所示,A、B两板间的加速电压为U
1,C、D两版间的偏转电压为U
2,一个静止的质量为m的α粒子(带2个元电荷)自A板起相继被加速、偏转,飞离偏转电场时的最大侧移为C、D板间距离的一半,则它的出射速度的大小为( )
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A.2
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B.
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C.2
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D.
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![manfen5.com 满分网](http://img.manfen5.com/res/GZWL/web/STSource/20131029200347837067067/SYS201310292003478370670006_ST/images0.png)
中子内有一个电荷量为
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的上夸克和两个电荷量为
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的下夸克,一简单模型是三个夸克都在半径为r的同一圆周,如图所示.下图给出的四幅图中,能正确表示出各夸克所受静电作用力的是( )
A.
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B.
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C.
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D.
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两个完全相同的金属小球,分别带有+3Q和-Q的电荷量,当它们相距r时(r比小球半径大得多),它们之间的库仑力是F,若把它们接触后分开,再置于相距
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的两点,则它们的库仑力的大小将变为( )
A.
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B.F
C.3F
D.9F
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一金属球,原来不带电,现沿球的直径的延长线放置一均匀带电的细杆MN,如图所示,金属球上感应电荷产生的电场在球内直径上a、b、c三点的场强大小分别为E
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A.E
a最小
B.E
b最小
C.E
c最小
D.E
a=E
b=E
c
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