试题与答案

北半球地磁场的竖直分量向下.如图所示,在北京某中学实验室的水平桌面上,放置边长为

题型:多选题

题目:

北半球地磁场的竖直分量向下.如图所示,在北京某中学实验室的水平桌面上,放置边长为L的正方形闭合导体线圈abcd,线圈的ab边沿南北方向,ad边沿东西方向.下列说法中正确的是(  )

A.若使线圈向东平动,则a点的电势比b点的电势低

B.若使线圈向北平动,则a点的电势比b点的电势低

C.若以ab为轴将线圈向上翻转,则线圈中感应电流方向为a→b→c→d→a

D.若以ab为轴将线圈向上翻转,则线圈中感应电流方向为a→d→c→b→a

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B解析:此为写保护口。露出小孔即写保护状态,反之则可读可写。

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