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山西省2024年中考总复习预测模拟卷(六)6物理试卷答案试卷答案

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山西省2024年中考总复习预测模拟卷(六)6物理试卷答案第一部分

7.如图所示,足够长的圆柱形水磁体竖直放置,其周围存在辐向磁场。一个圆形金属线圈与磁体中心同轴,线圈由静止释放后经过时间t速度达到最大值v,,此过程中线圈平面始终保持水平,已知金属线圈的匝数为N、质量为m、、直径为d、总电阻为R,金属线圈下落过程中经过的磁场的磁成应强度大小均为B,重力加速度为g,,不计空气阻力,下列说法正确的是金属线圈辐向磁场A.从上往下看,线圈中感应电流沿顺时针方向B.线圈达到最大速度之前做匀加速直线运动C.线圈下落速度为v时的热功率为NmgvD.t时间内通过线圈横截面的电荷量为mgt-mvNBd

山西省2024年中考总复习预测模拟卷(六)6物理试卷答案第二部分（待更新）

9如图甲所示的电路中,理想变压器原副线圈的匝数比为5:1,两小灯泡L1、L2的额定功率分别为4W、10W,M为内阻为r=4Ω的电动机,在P、Q间加如图乙所示的电压时,理想电流表的示数为I=2A,且所有用电器均正常工作.则甲B.灯泡L1、L2的额定电压之比为1:2A.电动机的额定电压为22VD.电动机的效率为70%C.电路消耗的总功率为40W