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1、衡水金卷2022-2023学年度高三一轮复习摸底测试卷数学一答案

2、2022到2023学年度高三一轮复习摸底测试卷衡水金卷新卷英语答案

3、衡水金卷先享题2023届新高三摸底联考地理重庆一答案

12.AD【解析】根据单位时间内的脉冲数,可求得车轮转动周期,从而求得车轮的角速度,最后由线速度公式,结合车轮半径,即可求得车轮的速度大小,故A项正确;根据qB=q4得Un=a,由电流的微观定义式I=neSv,其中n是单位体积内的电子数,e是电子所带的电量大小,S是导体的横截面积,是电子运动的速度,整理得v=ns,联立解得Un=,保持电流不变,霍尔电压UH与车速大小无关,故B项错误;霍尔元件的电流I是由负电荷定向运动形成的,故C项错误;由公式UBIsd可知,若长时间不更换传感器的电源,那么电流Ⅰ减小,则霍尔电势差将减小,故D项正确。

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