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第一章 单元测试
1、 问题:A charge +Q is fixed in position as a small charge +q is brought near it and released from rest. Which best describes the magnitude of the velocity of the charge +q as r, the distance between the charges increases? ( )
选项:
A:The magnitude of the velocity will increase, and its rate of increase will also increase.
B:The magnitude of the velocity will increase, but its rate of increase will decrease.
C:The magnitude of the velocity will remain constant.
D:The magnitude of the velocity will decrease, and its rate of decrease will also decrease.
E:The magnitude of velocity will increase, but its rate of decrease will increase. 点我阅读全文
的极限值是( )


和
之间放置另一个偏振片
,
绕沿光传播方向的轴旋转。设入射的自然光强度为
,求证:入射光通过这一组偏振片后,任一时刻的透射光强度
。(设
时,偏振片
[答案正确给3分,叙述有错或没有叙述扣1分]
[答案正确给3分,叙述有错或没有叙述扣1分]]
[答案正确给4分,叙述有错或没有叙述扣1分]