如图所示,a、b、c三条虚线为电场中的等势面,等势面b的电势为零

如图所示,abc三条虚线为电场中的等势面,等势面b的电势为零,且相邻两个等势面间的电势差相等,一个带正电的粒子在A时的动能为10J,在电场力作用下从A运动到B速度为零,当这个粒子的动能为7.5J时,其电势能为        (  )

A.12.5J                    B.2.5J

C.0                        D.-2.5J

 

答案

D

解析:略

 

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