If the electric potential at a point in space is considered to be zero, what can be said with certainty about the electric field at the same point

Electric field lines and equipotential lines are always a) parallel, b) perpendicular, or c) at an angle that depends on the strength of the field.

Oppositely charged parallel plates are separated by 5.09 mm. A potential difference of 600 V exists between the plates. (a) What is the magnitude of the electric field between the plates? (b) What is the magnitude of the force on an electron between the plates? (c) How much work must be done on the electron to move it to the negative plate if it is initially positioned 2.18 mm from the positive plate?