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# Four charges $+q, +q, +q,$ and $−q$ are respectively placed at the four corners (A, B, C, and D) of a square of side ‘a’ as shown in the given figure.The magnitude of the electric field at the centre of square is

The magnitude of the electric field at the centre of square is $\large\frac{1}{4 \pi \in _0} \frac{4 \sqrt q}{a^2}$