勻強電場中A、B兩點間距為2cm,兩點連線與電場方向成60°角,將一電荷量為﹣2×105C的電荷由A點移到B點,其電勢能增加了1×104J,則靜電力做的功為                                         J,A、B兩點間的電勢差為 V,電場強度的大小為                                                                                     V/m.

                                                                                                            

                                                                                                                                   


1×104;5;5×102

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