sat 关于electri potential!忘记附上问题了a parallel plate capacitor is charged to a potential difference of V,this results in a charge of +Q on one plate and a charge of -Q on the other.The capacitor is disconnected from the charging source,a

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sat 关于electri potential!忘记附上问题了a parallel plate capacitor is charged to a potential difference of V,this results in a charge of +Q on one plate and a charge of -Q on the other.The capacitor is disconnected from the charging source,a
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sat 关于electri potential!忘记附上问题了a parallel plate capacitor is charged to a potential difference of V,this results in a charge of +Q on one plate and a charge of -Q on the other.The capacitor is disconnected from the charging source,a
sat 关于electri potential!
忘记附上问题了
a parallel plate capacitor is charged to a potential difference of V,this results in a charge of +Q on one plate and a charge of -Q on the other.The capacitor is disconnected from the charging source,and a dielectric is then inserted.what happens to the potential difference and the stored electrical potential energy?
用decrease increase,unchange来回答
potential difference 和 stored elextrical potential energy是什么区别吗?
which points in the uniform electric field between the plates of the capacitor lie on the same equipotential?(图是一个capacitor,上面有4个点,两个是和capacitor平行,还有两个是和capacitor垂直) 答案是那两个和capacitor平行的点,为什么?他不是说是uniform electri field吗?那不应该是4个点的电压都该是一样的?
由于本人理解能力有限,就当我是一个初中生= =

sat 关于electri potential!忘记附上问题了a parallel plate capacitor is charged to a potential difference of V,this results in a charge of +Q on one plate and a charge of -Q on the other.The capacitor is disconnected from the charging source,a
我五月份要考了~上来百度知道解答大家的问题攒攒RP~由于学过AP物理所以SAT物理还是可以~
楼上那位说的不对啊,第一问不是电容器充放电问题.
potential difference 是指电势差,SAT物理中用V表示,也就是电压.capacitor是电容器,是用来储存电荷的,它储存电荷的能力用电容表示,符号是C.电荷量用符号Q表示,也就是电容器在充电过程中储存的电荷量.stored potential energy 就是指电能,SAT物理里用符号U表示.关于电容器,物理中有几个重要的公式.C=eA/d(e就是个介电系数,A是电容器两板的面积,d是电容器两板间的距离).C=Q/V 是基本公式,U=1/2QV 是关于储存电能的公式.有了这两个公式,电容器的题就都没有问题了.
第一题:电容器充电完毕以后在两板之间插入一个绝缘体,这种情况下就使介电系数e增大了,所以C变大,因为C=Q/V,所以V会decrease.再由于U=1/2QV,所以U也会decrease.(这道题我不能确定,还从来没遇到过电容器中插入绝缘体的题咧~不过公式和概念是没有错的)
第二个问题是这样的,平行电容器之间存在uniform electirc field,匀强电场,而匀强电场中有一个公式,E=V/d(E是场强,V是电势差,d是正极与负极间的距离) 由于场强的定义E=F/d,匀强电场的大小与正负极间的距离有关,所以匀强电场中场强相同的情况下必须是两点在同一水平线时(与平行电容器平行的线)所以根据这个公式,两点间电压相同的情况只可能是在它们俩的垂直距离为零时(在同一水平线上).所以答案是和Capacitor平行的点.
同学啊你要考SAT物理的话必须把知识点巩固好.建议你用barron或者princeton review.上面对每一个知识点都有详细的讲解,SAT2很重视基础概念,考的都是些简单的概念题所以如果知识点都没掌握是考不了的~

Electrical Potential 电位,电势;
第一句应该是解释电容的充电和放电的工作原理吧,我初中的物理快忘记完了。第一句的答案是decrease, 是电容放电的过程,potential difference 就是电压,电压不变unchange, 然后stored potential energy 减少 decrease;
第2问,potential difference...

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Electrical Potential 电位,电势;
第一句应该是解释电容的充电和放电的工作原理吧,我初中的物理快忘记完了。第一句的答案是decrease, 是电容放电的过程,potential difference 就是电压,电压不变unchange, 然后stored potential energy 减少 decrease;
第2问,potential difference 电位差,就是电压的意思;stored potential energy 电容储存电量;
第3问,我忘记了,呵呵。初中毕业几十年了。我只是个英语爱好者。你google一下有关电容的知识应该很容易理解的。

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