Complete Question
The complete question is shown on the first uploaded image
Answer:
The electric potential is [tex]V_P = \frac{4kQ}{a }[/tex]
Explanation:
From the question we are told that
The charge on each point is +Q
The length of the diagonal is 2a
Generally the electric potential is mathematically represented as
[tex]V = \frac{k Q}{r}[/tex]
Here r is the distance from each vertices of the square to the center P which is evaluated as
[tex]r = \frac{2a}{2} = a[/tex]
So the potential at the center due to one charge is evaluated as
[tex]V_1 = \frac{k Q}{a }[/tex]
Given that there are four charge the net electric potential at the center P will be
[tex]V_P = \frac{4kQ}{a }[/tex]
