[单选题]
Consider a uniform electric f17m4s*ro y(fczx+czgield ofs,0n *;ho 7 momxwe/wm 50 N/C directed toward the east. If the voltage measured relative to ground at a given point in the field is 80 V, what is the voltage at a point 1.0 m directly sou;/7mnemwx o0,oh mw*sth of that point?