在点电荷<img src="https://static.zxtiku.com/wangke/imgs/topic/d10c9897ca62a2a5225349ccf5e7b5c9.jpg"/>激发的电场中有一试探电荷<img src="https://static.zxtiku.com/wangke/imgs/topic/f400a47294bc321a39f49b940ba7a84e.jpg"/>，受力为<img src="https://static.zxtiku.com/wangke/imgs/topic/b99886b300ee8caa69dd858787615ce4.jpg"/>。当另一点电荷<img src="https://static.zxtiku.com/wangke/imgs/topic/e73feb050439cd517c85460d88ac5cb3.jpg"/>移入该区域后，<img src="https://static.zxtiku.com/wangke/imgs/topic/d10c9897ca62a2a5225349ccf5e7b5c9.jpg"/>与<img src="https://static.zxtiku.com/wangke/imgs/topic/f400a47294bc321a39f49b940ba7a84e.jpg"/>之间的作用力不变，仍为<img src="https://static.zxtiku.com/wangke/imgs/topic/00aa9dd8d210c5616d72d8a269e5cef1.jpg"/>。 A. 对 B. 错