What is the electric potential at point P at the center of the square if the electric potential is zero at infinity? Use q, d and ε0?

Question

Steve4Physics · Accepted Answer

At P:
The potentials from the +q and -q cancel because of symmetry.
The potentials from the +4q and -4q cancel because of symmetry.
The potentials from the +5q and -5q cancel because symmetry.

So we are left with the potentials from the two -2q charges, each a distance d from P
V = 2 x (-2q)/(4πε₀d) = -4kq/(4πε₀d)

What is the electric potential at point P at the center of the square if the electric potential is zero at infinity? Use q, d and ε0?

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