问题
选择题
| 如图所示，一个半径为L的半圆形硬导体AB以速度v，在水平U型框架上匀速滑动，匀强磁场的磁感应强度为B，回路电阻为R0，半圆形硬导体AB的电阻为r，其余电阻不计，则半圆形导体AB切割磁感线产生感应电动势的大小及AB之间的电势差分别为 |
|
A． B．2BLV，BLV C．BLV，2BLV D． |
答案
答案：D
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| 如图所示，一个半径为L的半圆形硬导体AB以速度v，在水平U型框架上匀速滑动，匀强磁场的磁感应强度为B，回路电阻为R0，半圆形硬导体AB的电阻为r，其余电阻不计，则半圆形导体AB切割磁感线产生感应电动势的大小及AB之间的电势差分别为 |
|
A． B．2BLV，BLV C．BLV，2BLV D． |
答案：D
| 完形填空 | ||||
In the past, I got up very early in the morning. I turned on the light and took out a physics book. Then I started 1 quietly. I worked so hard because 1 had a great 2 one day, I would be the first Chinese person to win the Nobel Prize (诺贝尔奖) in physics. When I was eight, I 3 physics. 1 first had physics 4 in Grade 8. In class, I 5 that there had never been a Nobel Prize winner from China. That made me sad, 6 I decided to change (改变) it. I began to work very hard. Later on, I found physics lessons at school too easy for me. I wanted to learn more, so I 7 a reading plan and started to find answers to more 8 problems. Now I am a 9 student in physics. And I am 10 to be closer to my dream after a few years' hard 11 . Of course, 12 being so interested in physics gives me trouble. My classmates always laugh at me when they are 13 about fashion or stars, because I know 14 about them. "Well, that doesn't matter too much, " I tell myself. "They don't 15 much about physics or the universe (宇宙), but I won't laugh at them. " | ||||
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