在电荷为-Q的点电荷A的静电场中,将另一电荷为q的点电荷B从a点移到b点.a、b两点距离点电荷A的距离分别为r1和r2,如图<img src="https://zk.995w.com/lqwvjeImg/1c/1c9abfda6ab19deb4f14e43d4df4c24e.png"style="width:164px;height:86px;">所示.则移动过程中电场力做的功为( )<br>· <img src="https://zk.995w.com/lqwvjeImg/56/56ee9084e21a4add3ac22ca40afdc08e.png"style="width:100px;height:50px;">.<br>· <img src="https://zk.995w.com/lqwvjeImg/d0/d07216d1bc0086b03466a069b87e069f.png"style="width:100px;height:50px;">.<br>· <img src="https://zk.995w.com/lqwvjeImg/44/44aac7b412a5a11ca3025209af67c376.png"style="width:100px;height:50px;">.<br>· <img src="https://zk.995w.com/lqwvjeImg/ca/ca6fdeb48d59515345f3b6df3892551e.png"style="width:85px;height:45px;">