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1 . 某物理兴趣小组在研究交变电流的产生和应用中,设计了以下三种形式,所用匀强磁场磁感应强度均为1.0T,图乙和图丙的轨道均在水平面上,磁场方向竖直向下。
(1)甲方案为:如图甲所示,让一面积为
的单匝矩形线圈
,在有界匀强磁场中绕中轴
以
的转速匀速转动,已知
为磁场分界线,求线圈从图示位置开始计时产生的交变电流的感应电动势的瞬时表达式;
(2)乙方案为:如图乙所示,
金属导轨与
金属直导轨分别在O点和A点接一阻值为
和
体积可忽略的定值电阻,导轨
的曲线方程为
(m),金属棒
平行于y轴,长为1.5m。在外力作用下以速度
水平向右匀速运动(b点始终在
轴上),金属棒与导轨接触良好,摩擦不计,整个电路中除了电阻
和
外,其余电阻均不计。求:金属棒在导轨上从
到
的运动过程中,外力做的功。
(3)丙方案为:如图丙所示,匝数
的理想变压器原线圈与水平放置的间距
的光滑金属导轨相连,导轨电阻不计,副线圈接阻值
的电阻,与导轨接触良好的电阻
的导体棒
在外力的作用下做简谐振动,其速度
(
)。求电阻R实际消耗的功率。
(1)甲方案为:如图甲所示,让一面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd73315bf7e7e2725e3cff8bedac241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35893041a02be39c9d0c1e9b329556eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/270ddac9587bf1ea553914cb69595ab2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3748e357417e0da4b8c652acdccb9419.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/270ddac9587bf1ea553914cb69595ab2.png)
(2)乙方案为:如图乙所示,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c317f156ce7a6fa94256d72ce0dcb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e890a5fde5e9845c45c31f5d95eae99a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7e2df96c91f677705cebaebba34f2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c317f156ce7a6fa94256d72ce0dcb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729b0425c4e0954ea60bab8bc059e128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/462ae5e1ac51cc00bf6bcdef52f5006c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e5af20b2f8c1fba4470f9650989e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d0f564605b8b3c80a4362f644c418f.png)
(3)丙方案为:如图丙所示,匝数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39c7e4636cce505c0922782b0305545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d6961838f6bd0917fe95735d7c53dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d7c26b988903e624660c76f770b8d99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e80c61344f43d19f078640276aff3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/230725339ec507c06ef3fa05ac286ce2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22964de2a093c97a8755dbe70487735e.png)
![](https://img.xkw.com/dksih/QBM/2021/5/23/2734257390837760/2735311604916224/STEM/af893c91-db98-4bcc-86b3-7d3978e4d638.png?resizew=479)
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2021-06-03更新
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4卷引用:四川省成都市树德中学2020-2021学年高二下学期5月阶段性测试物理试题