在点电荷 Q形成的电场中有一点A,当一个-q的检验电荷从电场的无

在点电荷 Q形成的电场中有一点A,当一个-q的检验电荷从电场的无限远处(电势为零)被移到电场中的A点时,电场力做的功为W,则该检验电荷在A点的电势能及电场中A点的电势分别为:(     )

A.      B.

C.       D.

答案

A

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