如图所示,水平放置的平行金属框架宽0.6m,金属棒垂直框架两边放

如图所示,水平放置的平行金属框架宽0.6m,金属棒垂直框架两边放置。电阻R=1Ω,金属棒电阻r=0.2Ω。磁感应强度B=0.5T的匀强磁场方向如图,其余电阻不计。当金属棒以v=4m/s的速度向右匀速运动时,ab棒两端电势差是         V,          端电势高。
   

答案

1,b

相关题目

针对西方国家对人民币汇率的责难,我国政府明确表示:汇
针对西方国家对人民币汇率的责难,我国政府明确表示:汇率的调整是渐进的过程。中国是个大国,要考虑各方面的承受能力,同时也要考虑中国在整
设集合,则等于(   )   A.   B.  C.   D.
设集合,则等于(   )   A.   B.  C.   D.
.过抛物线的焦点且倾斜角为的直线与抛物线在第一、四象限
.过抛物线的焦点且倾斜角为的直线与抛物线在第一、四象限分别交于A、B两点,则 的值等于(   )        A.5              B.4        
A A higher reading rate, with no loss of comprehension, will help you in other
A A higher reading rate, with no loss of comprehension, will help you in other subjects as well as in English, and the general principles apply to any language. Naturally, you will not read every boo
如图1所示,传送带保持1m/s的速度顺时针转动,现将一质量m=0
如图1所示,传送带保持1m/s的速度顺时针转动,现将一质量m=0.5kg的物体轻轻地放在传送带的A点上,设物体与传送带的动摩擦因u=0.1,A\B间的距离L=2.5m
_____ occurred to me that the murder happened ____ a rainy day. A. What; in   
_____ occurred to me that the murder happened ____ a rainy day. A. What; in          B. What; on          C. It; in             D. It; on  
  World travel has moved on to a new level as new websites spring up to enable
  World travel has moved on to a new level as new websites spring up to enable travelers to plan their trips online. Virtual tourism is the latest name of the game and although relatively new, has
从1 L  1  mol/LNaOH溶液中取出100 ml,下列关于这100 ml溶液的
从1 L  1  mol/LNaOH溶液中取出100 ml,下列关于这100 ml溶液的叙述中错误的是 A.含NaOH   0.1 mol               B.浓度为  1  mol/L C.含NaOH  4g  

最新题目