中指等四手指弯曲成螺旋状,手心空,姆指伸直且与四指垂直.
对直线电流,姆指指向...电流方向,四指绕向...磁场方向
对通电线圈,四指绕向...线圈电流方向,姆指栺向北极.
猜你喜欢
- 1it is generally-accepted that many English-speaking cultures are among the richest and most dynamic cultures in the worl
- 2no pain no gain . a friend in need is a friend indeed.time will tell
- 3好听的英文名,像COCO之类的,简洁又好听!
- 4★有哪些俗语成语来源于佛教?说明了什么?
- 5He is good at playing basketbaii.改为同义句
- 65公斤有多重?是个什么概念
- 7扇形的圆心角是3/派,弧长是派cm,求扇形内切圆的半径
- 8《我喜欢的老师》英语作文
- 9________太棒了 半命题作文
- 10He said nothing and he kept s_________ all the time