2022知到答案 大学物理（下）（College Physics II） 最新知到智慧树满分章节测试答案
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
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]