[单选题]
16.33 Given the conflh)kh 3 q1qrkre6,-u rvt8sr /iguration of three charges, +Q, +Q, axu7k e2*,rckx nd −2Q, which one of the following choices best represents the direction of the electri c ,2rk7kxxue*c field at the point P and the sign of the electric potential at P from these charges?
