Final answer:
Point 2 on the same equipotential line will have the same potential as point 1, which is -1 V, since the potential is constant along an equipotential line.
Step-by-step explanation:
The question involves understanding equipotential lines and their significance in electric fields. Equipotential lines are lines connecting points where the electric potential is the same, and these lines are always perpendicular to electric field lines. When dealing with a single electric charge, the potential at any point on an equipotential line is constant. Therefore, if point 1 is on an equipotential line with a potential of -1V, point 2 on the same equipotential line will also have a potential of -1 V, assuming no other charges or changes in the field affect the potential in the region between these two points.