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【单选题】
( 2020 春 • 站前区校级月考)如图所示,虚线为位于 O 位置的点电荷形成电场中的等势面,已知三个等势面的电势差关系为 φ 1 - φ 2 = φ 2 - φ 3 ,图中的实线为一带负电的粒子进入该电场后的运动轨迹,与等势面相交于图中的 a 、 b 、 c 、 d 四点,已知该粒子仅受电场力的作用,则下列说法正确的是( )A.
该粒子只有在 a 、 d 两点的动能与电势能之和相等
B.
场源电荷是正电荷
C.
φ 1 ＞ φ 2 ＞ φ 3
D.
电场力对该粒子先做负功后做正功
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