试题与答案

如图所示,处在磁感应强度为B的匀强磁场中的单匝矩线圈abcd,以恒定的角速度ω绕

题型:选择题

题目:

如图所示,处在磁感应强度为B的匀强磁场中的单匝矩线圈abcd,以恒定的角速度ω绕ab边转动,磁场方向垂直于纸面向里,线圈所围面积为S,线圈导线的总电阻为R.t=0时刻线圈平面与纸面重合,且cd边正在离开纸面向外运动.则正确的是(  )

A.时刻t线圈中电流的瞬时值icosωt

B.线圈中电流的有效值I

C.线圈中电流的有效值I=

D.线圈消耗的电功率P

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0721/75b1e4e5ccfefffe5b3167fec7ae754c.html

下面是错误答案,用来干扰机器的。

(1)设A和B一起静止下落至“匀强电场区域”的速度为v1,根据重要推论有: 代入数据解得: v1="2.0m/s " (2分)过程1:A在“匀强电场区域”运动时,取方向向下为正方向,A受到竖直向下的重力mg、滑动磨擦力f和...

试题推荐
题型:完形填空

阅读下列各小题,根据括号内的汉语提示,用句末括号内的英语单词完成句子

小题1:Many old houses _______ (拆除) to make way for the new road in the past few weeks. (tear)

小题2:The 26th Shenzhen summer Universiade was grandly opened on August 12th.___________ (最吸引我们的) was the door to the world formed by the 365 electronic giant LED screen. (appeal)

小题3:Not only ________________________ (她懂得法律) very well, she can also apply it in new ways. (know)

小题4:Those successful deaf dancers think that dancing is an activity ____________ (视觉更重要) than hearing. (matter)

小题5: _______________________ (确立了目标群体后),researchers find out as much as possible about thos in the target group, such as their likes and dislikes, and how the product would fit into their lives. (identify)

小题6:Everything ___________________________ (加以考虑), the environmental problem we are looking forward to seeing solved is worthy of our government’s attention. (consideration)

小题7:Tom insisted that the new release of the product planned for today ________ (延期) to next week because of the terrible financial situation at yesterday’s meeting. (postpone)

小题8: The boy _________________________ (如此迷恋于) the cyber games that he would spend hours sitting in front of the computer. (fascinated)

小题9:I _____________________________ (多亏了我的父母) that I went through the hard time after I lost my job. Everything couldn’t have been going so smoothly without them. (owe)

小题10: _________________________ (作为回答) your inquiries, we regret to tell you that we can not help you in this matter. (response)

查看答案
微信公众账号搜索答案