The potential (relative to infinity) at the midpoint of a square is 3.0 V when a point charge of Q is located at one of the corners of the square. What is the potential (relative to infinity) at the center when each of the other corners is also contains a point charge of Q

12.0 V

Explanation:

Data :

Potential difference due to a single charge (+Q), E = 3.0 V

The Electric potential for the system of charges is given as:

for single charge, E = 3.0 V =  ->eq(1)

And for 4 charges:

-eq(2)

from eq(1) and (2) we have

E = 4 × 3.0 V = 12 V

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explanation: