[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.00,0:00:04.05,Default,,0000,0000,0000,,在从前的视频中我们讨论过流过电线的电流
Dialogue: 0,0:00:04.05,0:00:07.10,Default,,0000,0000,0000,,能够产生感应磁场
Dialogue: 0,0:00:07.10,0:00:09.50,Default,,0000,0000,0000,,在这个视频中我们会讲到
Dialogue: 0,0:00:09.50,0:00:11.55,Default,,0000,0000,0000,,它的反定则
Dialogue: 0,0:00:11.55,0:00:17.64,Default,,0000,0000,0000,,磁场的改变如何在闭合电路中影响或感生电流
Dialogue: 0,0:00:17.64,0:00:19.82,Default,,0000,0000,0000,,我们现在要从（磁场的）改变着手
Dialogue: 0,0:00:19.82,0:00:24.70,Default,,0000,0000,0000,,实际上我们先来关注一下磁通量
Dialogue: 0,0:00:24.70,0:00:27.29,Default,,0000,0000,0000,,闭合电路里的磁通量