题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234241-42999.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234241-22308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234241-30942.png)
(1)电阻R2的电功率;
(2)a、b两点的电势(设c点电势为零)
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234241-66685.jpg)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234241-85618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234242-15167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234242-60473.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234242-93042.png)
由法拉第电磁感应定律得:
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234242-69607.png)
通过回路的电流:
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234243-56472.png)
电阻
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234243-55867.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234241-85618.png)
(2)依题意可知,
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234243-37354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234243-37287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234243-78574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234244-69109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234243-78574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234244-15336.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234244-76144.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234242-15167.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234244-47373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234242-60473.png)
核心考点
试题【如图(a)所示的螺线管,匝数n=1500匝,横截面积S=20cm2,电阻,与螺线管串联的外电阻,。方向向左,穿过螺线管的匀强磁场的磁感应强度按图(b)所示规律变】;主要考察你对电磁感应等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234207-67220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234156-22550.png)
(1)电源的输出功率P是多大?
(2)粒子在A、B之间运动的过程中,沿垂直于板方向通过的距离y是多大?
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234157-24627.png)
A.白炽灯发光 | B.电动机转动 |
C.电子束的磁偏转 | D.发电机发电 |
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234142-64984.jpg)
A.铜导线运动速度最大 |
B.铁导线运动速度最大 |
C.三根导线上产生的感应电动势相同 |
D.在相同时间内,它们产生的热量相等 |
(1)a b中的电流大? a b两点间的电压多大?
(2)维持a b做匀速运动的外力多大?
(3)a b向右运动1m的过程中,外力做的功是多少?电路中产生的热量是多少?
![](http://img.shitiku.com.cn/uploads/allimg/20200201/20200201234132-65213.png)
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