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
展开钦州市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 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
答案 | C | D | A | C | B | D | A | B |
二、多项选择题（16分）
题号 | 9 | 10 | 11 | 12 |
答案 | BC | AC | BD | AD |
三、实验题（17分）
13.（每空2分，共8分）（1）甲 （2）ABDFH （3）1.5 0.7
14.（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
