题目

两个完全相同的金属小球，带电荷量分别为+Q和-5Q，当两小球相距为d（d远大于小球半径）时，它们之间的库仑力大小为F。若让两小球接触后再放回原处，则它们之间的库仑力大( )A. B. C. D. 答案：【答案】D【解析】初始时，两球之间的库仑力为两球接触后，电荷先中和再平分，两球电荷量变为，故库仑力变为故D正确；故选D。Julia likes borrowing money from her classmates but she is now completely debt free, ________ all her debts．A.repaidB.having been paidC.being repaidD.having repaid