电感L＝500mH的线圈．其电阻忽略，设在某一瞬时，其中的电流每秒增加5A，此时线圈两端的电压是（　　）。

A、<img width="54" height="23" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/691ec54a-8586-4efc-82ae-564619317e13.png" />

B、<img width="60" height="21" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/fe302487-385b-4e5e-b984-8db1dfe198e7.png" />

C、<img width="72" height="22" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/1b890984-5286-401f-89fa-20cc50c5b2d8.png" />

D、<img width="62" height="23" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/da2d9c90-cce3-4fe2-b912-64206af3e9d0.png" />