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The electric field at a particular point halfway among the two positive charges is the sum of the electric fields from each positive charge.

The electric field at any point due to a point charge is given by,

\(\overrightarrow E = \frac{{kQ}}{{{r^2}}}\hat r\)

Here, k is the Coulomb鈥檚 constant, Q is the charge and r is the distance.

The electric field is a vector quantity. At the midpoint between the two charges, the magnitude of the electric field is the same but opposite in direction. Therefore, due to both charges, the electric field is added up to give zero at the midpoint.

The electric potential is given as:

\(V = \frac{{kQ}}{r}\)

Electric potential is a scalar quantity. The electric potential due to a positive point charge is positive. So, the electric potential due to both the charges will add up to give a positive value of the electric potential at the point halfway between the two charges.

Thus, the correct option is (a).