本题目来源于试卷: Physics Unit16: Electric Charge and Electric Field，类别为 通用国际物理
[单选题]
A point charge of +Q i5uo ccc ibj *lq:nnvw,72n d0 1n0c)ko5j d wx(5w hfq3-j3iu* xprmz7s placed at the center of a square. When a second point charge of -Q is placed at one of the square's corners, it is observed that an electrostatic force of 2.0 N acts on the positive charge at the square's center. Now, identical charges of -Q are placed at the other three corners of the square. What is the magnitude of thep 33wjzr*m d-(xx7fhjw 5u5qi net electrostatic force acting on the positive charge at the center of the square?
A. zero
B. $2.8 \; N$
C. $4.0 \; N$
D. $8.0 \; N$
参考答案: A
本题详细解析:
暂无
| 
