Charge 5 mu C-2 mu C-and -9 mu C are placed the comers A-B-C and D of a square ABCD of side 2m- The electric potential the center of the square is-27KV -27sqrt - 2 -90KVzero

Question

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Charge 5μ C,−2μ C,and −9μ C are placed at the comers A,B,C and D of a square ABCD of side 2m. The electric potential at the center of the square is:−27KV−27√2−90KVzero

Charge $5 μ C$ , $- 2 μ C$ ,and $- 9 μ C$ are placed at the comers A,B,C and D of a square ABCD of side $2 m$ . The electric potential at the center of the square is:
$- 27 K V$
$- 27 \sqrt{2}$
$- 90 K V$
$z e r o$