普通高中人教版物理选修3-2第2,3题怎么做?2、有人说,线圈平面转到中性面的瞬间,穿过线圈的磁通量最大,因而线圈中感应电动势最大,线圈平面跟中性面垂直的瞬间,穿过线圈的磁通量为0,因而感应电动势为0.这种说法对不对?为什么?3、设磁感应强度为0.01T,单匝线圈边长AB为20cm,宽AD为10cm,转速为50r/s,求线圈转动时感应电动势的最大值?
二、这种说法是错误的.因为：法拉弟电磁感应定律：电路中感应电动势的大小,跟穿过这一电路的磁通量的变化率成正比.1.当线圈平面转到中性面的瞬间,穿过线圈的磁通量最大.当线圈再转过一个极小的角度时,穿过线圈的磁通量无变化.即,此时磁通量的变化率为0.所以,线圈中感应电动势为0.2.当线圈平面跟中性面垂直的瞬间,穿过线圈的磁通量为0.当线圈再转过一个极小的角度时,穿过线圈的磁通量变化最大.即,此时磁通量的变化率为最大0.所以,线圈中感应电动势为最大. 或者,换一种解释方法：1.当线圈平面转到中性面的瞬间,线圈平面和转轴平行的两边的线速度的方向和磁感应强度的方向平行.即,此时这两边不做切割磁力线的运动,所以它们不产生感应电动势.2.当线圈平面跟中性面垂直的瞬间,线圈平面和转轴平行的两边的线速度的方向和磁感应强度的方向垂直.即,此时这两边以最大速度做切割磁力线的运动,所以它们产生的感应电动势最大.又这两边是串联的,所以产生的感应电动势为它们分别产生的感应电动势这和.三、感应电动势最大值 E=NBSω=NBS2πn=1×0.2×0.1×2π×50≈12.56(V) . 对否,请参考!
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“3，BLV=BLWR,因为两边都在切割，所以总的感应电动势等于2倍”说法错误。切割半径是边长的一半，所以是是blv
2.说法错误。依据法拉第电磁感应定律知：电动势的高低（大小）决定于线圈匝数及磁通量的变化率。匝数不变时，只决定于磁通量的变化率。注意：磁通量的变化率不同于磁通量的变化，也不同于磁通量。所以，电动势跟磁通量及其变化均无关。3.可用公式直接计算：&
2,不对，因为感应电动势=δ磁通量/δt,也就是等于其变化率，故，磁通量为0时，感应电动势最大，磁通量为最大时，感应电动势为0.3，BLV=BLWR,因为两边都在切割，所以总的感应电动势等于2倍
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1.清晨,荷池里的鱼儿一打挺儿,溅起的水花落在荷叶上,一颗颗水珠在荷叶上滚动,好看极了.|| 有一个孩子欢快地叫着：“你们快来看呀,那荷叶上的水珠,多像一粒粒珍珠啊!”等那小孩走后,水珠得意地对荷叶说：“喂!你听见了吗?刚才那个小孩在夸我呢!你看,由于我的存在,才给你增添了光辉.人们到这里,不都是来看我吗?”荷叶听了微笑不语.|| 太阳升高了,水珠被蒸发了.荷叶上只留下了一块块泥印.||2.要正确的认识自己.3.荷叶与水珠.
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扫描下载二维码> 托福TPO2口语Task3题目文本及答案解析
托福TPO2口语Task3题目文本及答案解析
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摘要：托福TPO2口语Task3题目文本及答案解析，TPO1口语task3题目、TPO1口语task3答案解析、托福TPO1口语task3范文。更多托福备考信息尽在智课网托福频道!
　　TPO2口语Task3题目文本及答案解析，TPO1口语task3题目、TPO1口语task3答案解析、TPO1口语task3范文。更多托福备考信息尽在托福频道!
　　托福TPO2口语task3题目 Reading Part:
　　Bus Service Elimination Planned
　　The university has decided to discontinue its free bus service for students. The reason given for this decision is that few students ride the buses and the buses are expensive to operate. Currently, the buses run from the center of campus past university buildings and through some of the neighborhoods surrounding the campus. The money saved by eliminating the bus service will be used to expand the over crowded student parking lots.
　　托福TPO2口语task3题目 Question:
　　The man expresses his opinion of the university&s plan to eliminate the bus service.State his opinion and explain the reasons he gives for holding that opinion.
　　托福TPO2口语task3答案解析：
　　1. Reading key
　　(1.1) Announcement: elimination of bus service
　　(1.2) Reason 1: not many students take it
　　(1.3) Reason 2: money saved can be used to build more parking lots
　　2. Listening key
　　(2.1) The man disagrees with it
　　(2.2) Reason 1: the bus route is out of date
　　(2.2.1) Details: it only goes through the areas that are too expensive for students to live in
　　(2.2.2) Suggestion: change the bus route, then more people will be willing to take the bus
　　(2.3) Reason 2: building more parking lots is not a good idea
　　(2.3.1) Details:+ parking - bus & more people will drive & more pollution and traffic problems on campus
　　托福TPO2口语task3范文：
　　The university is planning to eliminate its free bus service, because not many students use it and the school can use the money saved to build more parking lots. In the conversation, the man disagrees with the university&s plan. First of all, he thinks the reason that few students take the bus is because the route is out-of-date, it only goes through the areas that have gone too expensive for students to live. Instead of eliminating the bus service, the university should change the bus route to where more students live. Second, he thinks that more student will drive if the university used the saved money to build more parking lots, and that will create more traffic problem and increase the noise level on campus.
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　　TPO2口语Task3题目文本及答案解析，TPO1口语task3题目、TPO1口语task3答案解析、TPO1口语task3范文。更多托福备考信息尽在托福频道!
　　托福TPO2口语task3题目 Reading Part:
　　Bus Service Elimination Planned
　　The university has decided to discontinue its free bus service for students. The reason given for this decision is that few students ride the buses and the buses are expensive to operate. Currently, the buses run from the center of campus past university buildings and through some of the neighborhoods surrounding the campus. The money saved by eliminating the bus service will be used to expand the over crowded student parking lots.
　　托福TPO2口语task3题目 Question:
　　The man expresses his opinion of the university&s plan to eliminate the bus service.State his opinion and explain the reasons he gives for holding that opinion.
　　托福TPO2口语task3答案解析：
　　1. Reading key
　　(1.1) Announcement: elimination of bus service
　　(1.2) Reason 1: not many students take it
　　(1.3) Reason 2: money saved can be used to build more parking lots
　　2. Listening key
　　(2.1) The man disagrees with it
　　(2.2) Reason 1: the bus route is out of date
　　(2.2.1) Details: it only goes through the areas that are too expensive for students to live in
　　(2.2.2) Suggestion: change the bus route, then more people will be willing to take the bus
　　(2.3) Reason 2: building more parking lots is not a good idea
　　(2.3.1) Details:+ parking - bus & more people will drive & more pollution and traffic problems on campus
　　托福TPO2口语task3范文：
　　The university is planning to eliminate its free bus service, because not many students use it and the school can use the money saved to build more parking lots. In the conversation, the man disagrees with the university&s plan. First of all, he thinks the reason that few students take the bus is because the route is out-of-date, it only goes through the areas that have gone too expensive for students to live. Instead of eliminating the bus service, the university should change the bus route to where more students live. Second, he thinks that more student will drive if the university used the saved money to build more parking lots, and that will create more traffic problem and increase the noise level on campus.
　　微信扫描下方二维码，第一时间知晓托福考试真题预测及解析，还有北美留学最新动态喔~(微信号：toefl120)!
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精彩栏目推荐写这种一二三123用语文数字怎么写
我爱阿狸144
阿拉伯数字 0 1 2 3 4 5 6 7 8 9 10中国数字 〇 一二 三 四 五 六 七 八 九 十中国汉字 零 壹 贰 叁 肆 伍 陆 柒 捌 玖 拾罗马数字 I II III IV V VI VII VIII IX X
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一百二十三。
以防以后你需要0--10的，都告诉你好了零 壹 贰 叁 肆 伍 陆 柒 捌 玖 拾
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