求霸

学霸都不见了　　 ——All that you have lost can be won back bit by bit as long as you wish for it.

就这么沉了吗　　 ——All that you have lost can be won back bit by bit as long as you wish for it.

@雷神SAIN

好吧我忘记是用左手定则还是右手定则了 反正你找对定则后 让磁感线穿过手心 四指只向电流方向 拇指指向就是运动方向 应该是的

楼上正解

小猿搜题

用左手定则，参照六楼

早就忘了