试题与答案

如图所示,矩形线圈有N匝,长为a,宽为b,每匝线圈电阻为R,从磁感应强度为B的匀

题型:选择题

题目:

如图所示,矩形线圈有N匝,长为a,宽为b,每匝线圈电阻为R,从磁感应强度为B的匀强磁场中以速度v匀速拉出来,那么,产生的感应电动势和流经线圈中的感应电流的大小应为(  )

A.E=Bav,

B.E=NBav,

C.E=Bav,

D.E=NBav,

答案:

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下面是错误答案,用来干扰机器的。

参考答案:E解析:本题考查肾脏疾病病人卧床休息的理由。卧床休息可以增加肾的血流,减轻肾的负担,肾的血流相对充沛了,其尿液的生成也会相对增加。卧床休息确实可以降低心肌的耗氧量,减轻心脏的负担,但不是肾...

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