（单选题）如图所示，两个均匀带电球体被牢牢地固定在...

选项

A. https://qn-next.xuetangx.com/15665406764545.jpg、https://qn-next.xuetangx.com/15665406427836.jpg、https://qn-next.xuetangx.com/15665406446214.jpg、https://qn-next.xuetangx.com/15665406441688.jpg、https://qn-next.xuetangx.com/15665406451803.jpg、https://qn-next.xuetangx.com/15665406751535.jpg、[{"key":"A","value":" class="import-img" height="100px" ","showEditor":false},{"key":"B","value":" class="import-img" height="100px" ","showEditor":false},{"key":"C","value":" class="import-img" height="100px" ","showEditor":false},{"key":"D","value":" class="import-img" height="100px" ","showEditor":false},{"key":"E","value":" class="import-img" height="100px" ","showEditor":false},{"key":"F","value":" class="import-img" height="100px" ","showEditor":false}]

B. https://qn-next.xuetangx.com/15665406764545.jpg、https://qn-next.xuetangx.com/15665406427836.jpg、https://qn-next.xuetangx.com/15665406446214.jpg、https://qn-next.xuetangx.com/15665406441688.jpg、https://qn-next.xuetangx.com/15665406451803.jpg、https://qn-next.xuetangx.com/15665406751535.jpg、[{"key":"A","value":" class="import-img" height="100px" ","showEditor":false},{"key":"B","value":" class="import-img" height="100px" ","showEditor":false},{"key":"C","value":" class="import-img" height="100px" ","showEditor":false},{"key":"D","value":" class="import-img" height="100px" ","showEditor":false},{"key":"E","value":" class="import-img" height="100px" ","showEditor":false},{"key":"F","value":" class="import-img" height="100px" ","showEditor":false}]

C. https://qn-next.xuetangx.com/15665406764545.jpg、https://qn-next.xuetangx.com/15665406427836.jpg、https://qn-next.xuetangx.com/15665406446214.jpg、https://qn-next.xuetangx.com/15665406441688.jpg、https://qn-next.xuetangx.com/15665406451803.jpg、https://qn-next.xuetangx.com/15665406751535.jpg、[{"key":"A","value":" class="import-img" height="100px" ","showEditor":false},{"key":"B","value":" class="import-img" height="100px" ","showEditor":false},{"key":"C","value":" class="import-img" height="100px" ","showEditor":false},{"key":"D","value":" class="import-img" height="100px" ","showEditor":false},{"key":"E","value":" class="import-img" height="100px" ","showEditor":false},{"key":"F","value":" class="import-img" height="100px" ","showEditor":false}]

D. https://qn-next.xuetangx.com/15665406764545.jpg、https://qn-next.xuetangx.com/15665406427836.jpg、https://qn-next.xuetangx.com/15665406446214.jpg、https://qn-next.xuetangx.com/15665406441688.jpg、https://qn-next.xuetangx.com/15665406451803.jpg、https://qn-next.xuetangx.com/15665406751535.jpg、[{"key":"A","value":" class="import-img" height="100px" ","showEditor":false},{"key":"B","value":" class="import-img" height="100px" ","showEditor":false},{"key":"C","value":" class="import-img" height="100px" ","showEditor":false},{"key":"D","value":" class="import-img" height="100px" ","showEditor":false},{"key":"E","value":" class="import-img" height="100px" ","showEditor":false},{"key":"F","value":" class="import-img" height="100px" ","showEditor":false}]

E. https://qn-next.xuetangx.com/15665406764545.jpg、https://qn-next.xuetangx.com/15665406427836.jpg、https://qn-next.xuetangx.com/15665406446214.jpg、https://qn-next.xuetangx.com/15665406441688.jpg、https://qn-next.xuetangx.com/15665406451803.jpg、https://qn-next.xuetangx.com/15665406751535.jpg、[{"key":"A","value":" class="import-img" height="100px" ","showEditor":false},{"key":"B","value":" class="import-img" height="100px" ","showEditor":false},{"key":"C","value":" class="import-img" height="100px" ","showEditor":false},{"key":"D","value":" class="import-img" height="100px" ","showEditor":false},{"key":"E","value":" class="import-img" height="100px" ","showEditor":false},{"key":"F","value":" class="import-img" height="100px" ","showEditor":false}]

F. https://qn-next.xuetangx.com/15665406764545.jpg、https://qn-next.xuetangx.com/15665406427836.jpg、https://qn-next.xuetangx.com/15665406446214.jpg、https://qn-next.xuetangx.com/15665406441688.jpg、https://qn-next.xuetangx.com/15665406451803.jpg、https://qn-next.xuetangx.com/15665406751535.jpg、[{"key":"A","value":" class="import-img" height="100px" ","showEditor":false},{"key":"B","value":" class="import-img" height="100px" ","showEditor":false},{"key":"C","value":" class="import-img" height="100px" ","showEditor":false},{"key":"D","value":" class="import-img" height="100px" ","showEditor":false},{"key":"E","value":" class="import-img" height="100px" ","showEditor":false},{"key":"F","value":" class="import-img" height="100px" ","showEditor":false}]

正确答案：

名词解析

提示：根据库仑定律和电力叠加原理，两个静止的正的带电体，相互作用力大小相等，方向相反。 (vec {F}_{12}=-vec {F}_{21})

（单选题）如图所示，两个均匀带电球体被牢牢地固定在位于气垫导轨的支架上，支架与导轨间的摩擦可以忽略不计。如果球2的电荷量是球1的电荷量的3倍。问下面哪个图正确地表示了这两个球之间库仑力的大小和方向？