1:1  11-16[理·物理]徐老师带领你细心做题，摆脱题目陷阱
推荐理由：看题做题，摆脱题目陷阱，走出误区 讲解人： http://www.jiandan100.cn/teacher/37601926f934442ba793fd95862b39f7/ ，首都师范大学附属中学物理高级教师，北京海淀区骨干教师、学科带头人和先进工作者。 题面：半径为a右端开小口的导体圆环和长为2a的导体直杆，单位长度电阻均为R0。圆环水平固定放置，整个内部区域分布着竖直向下的匀强磁场，磁感应强度为B。杆在圆环上以速度v平行于直径CD向右做匀速直线运动，杆始终有两点与圆环良好接触，从圆环中心O开始，杆的位置由θ确定，如图所示。则 （ ） B． 
C．θ=0时，杆受的安培力大小为
D． ，杆受的安培力大小为【答案及详解】 本部分内容设定了隐藏,需要回复后才能看到
 跟帖分享你的答案，即可看到正确答案和解析！别忘了回帖后再点进来查看答案哦~
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沙发#
发布于：2012-11-16 20:11
求答案
求答案与具体讲解呀. |
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板凳#
发布于：2012-11-16 22:48
B 对吗
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地板#
发布于：2012-11-17 11:32
cccccccccccccccccccccccc
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4楼#
发布于：2012-11-17 14:30
量子力学雨过天晴下午
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6楼#
发布于：2012-11-17 19:58
找到了
这正是我所需要的题，太感谢了 |
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7楼#
发布于：2012-11-17 21:05
不会做，
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9楼#
发布于：2012-11-18 09:18
fggfgfgffffffffffffffffffffffffffffff
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