標題: 有關phy 的問題 [打印本頁] 作者: today1314 時間: 15/9/2008 12:29 AM 標題: 有關phy 的問題 我想問點解畫electric field line 時, positive charge 的field 係向出面????作者: abc666 時間: 15/9/2008 02:33 PM The electric field strength at a point of the electric field is defined as the force that would be exerted on a positive test unit charge at that point.
因為科學家define 了positive test charge positive test charge同positive charge 會repel 所以force向出 electric field 也向出