2020-2021学年广西钦州市高二上学期期末教学质量监测物理试题 pdf版

钦州市2020年秋季学期教学质量监测参考答案高二  物 理一、单项选择题（24分）题号12345678答案CDACBDAB二、多项选择题（16分）题号9101112答案BCACBDAD三、实验题（17分）13.（每空2分，共8分）（1）甲   （2）ABDFH　　 （3）1.5　     0.714.（每空3分，共9分）（1）A1    如图所示     （2）（Ω）    四、计算题（43分）15.（8分）解析：设滑块与N点的距离为L，由动能定理可得，qEL－μmgL－mg·2R＝mv2－0     ·····················3分小滑块在C点时，mg＝m  ·········································3分解得v＝2 m/s，L＝20 m  ·········································2分16.（10分）解析：（1）根据闭合电路欧姆定律，  ····································2分  ········································1分 （2）电源的输出功率：  ·········································2分 （3）电场强度：  ···············································1分粒子做类似平抛运动，有： ····································1分
   ························································1分      ·······················································1分
联立解得： ················································1分17.（12分） 解析：(1) 粒子在电场中加速，由动能定理有：       ···························2分解得：  ···················································2分(2) 粒子在磁场中的运动轨迹刚好与PQ相切时的轨道半径，是粒子从边界MN离开磁场最大轨道半径，如图由几何知识得： ·········································2分粒子在磁场中做圆周运动，洛伦兹力提供向心力，   ··············2分得： ·····························2分粒子最终从磁场边界MN离开磁场，磁感应强度：  ·····················2分18.（13分）解析：（1）根据法拉第电磁感应定律，得感应电动势为：   ····················1分根据闭合电路的欧姆定律，得感应电流为：   ·····················1分导体棒受到的安培力为：   ···································1分导体棒做匀速运动，处于平衡状态，由平衡条件得：   ··········································2分代入数据解得：  ···········································1分（2）金属棒运动过程，由能量守恒定律得： ···························3分电阻R产生的热量为： ·······································2分代入数据解得：J  ··········································2分