Relating electric field to electric potential

Question

Two equal positive charges are separated by a distance R and are moved to a distance 4R away from each other. What happens to the electric field and electric potential at point P, midway between the charges?

Answer 1

The electric field was zero to begin with, and remains zero when the charges are spread apart, since they produce equal but opposite fields on a test charge located at the midpoint.

The potential changes from

kq/(R/2) + kq/(R/2)

to

kq/(2R) + kq/(2R).

kq/(R/2) + kq/(R/2) = 4kq/R

kq/(2R) + kq/(2R) = kq/R

The potential drops from 4kq/R to kq/R.