题目4单选题
如图所示,在相距2R的点电荷+q和-q的电场中,把电荷+Q从O点沿弧OCD移到D点,则电场力作功与+Q(系统)电势能的增量分别为 <img src="https://tihai-oss-cloud.itihey.com/img/5d5d45d154627ea7d0d48e7190bbd56b.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/7b39d6c930b22153271cfff32209d0b3.png">,<img src="https://tihai-oss-cloud.itihey.com/img/c25e2cd810a9c843193f7b6790833f20.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/feef41e67f6e434d3106fcac13e6cc62.png">,<img src="https://tihai-oss-cloud.itihey.com/img/cea234f99324f25624f37bc93dfed0e6.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/cea234f99324f25624f37bc93dfed0e6.png">,<img src="https://tihai-oss-cloud.itihey.com/img/feef41e67f6e434d3106fcac13e6cc62.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/c25e2cd810a9c843193f7b6790833f20.png">,<img src="https://tihai-oss-cloud.itihey.com/img/7b39d6c930b22153271cfff32209d0b3.png">