如图，三个固定的带电小球a、b和c，相互间的距离分别为ab=5cm，bc=3cm，ca=4cm。小球c所受库仑力的合力的方向平衡于a、b的连线。设小球a、b所带电荷量的比值的绝对值为k，则() [img src="https://img.haodaxue.net/uploadimg/image/20200606/20200606160628_65239.png" alt="" />
A.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591430809201052.png" />
B.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591430827859001.png" />
C.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591430838546176.png" />
D.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591430850166786.png" />
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正确答案： D 答案分析：img src="https://img.haodaxue.net/uploadimg/image/20200606/20200606160748_24412.png" alt="" />
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