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Four identical charges \( Q \) are fixed at the four corners of a square of side \( a \). The electric field at a point \( P \) located symmetrically at a distance \( a / \sqrt{2} \) from the center of the square is
(1) \( \frac{Q}{2 \sqrt{2} \pi \varepsilon_{0} a^{2}} \)
(2) \( \frac{Q}{\sqrt{2} \pi \varepsilon_{0} a^{2}} \)
(3) \( \frac{2 \sqrt{2} Q}{\pi \varepsilon_{0} a^{2}} \)
(4) \( \frac{\sqrt{2} Q}{\pi \varepsilon_{0} a^{2}} \)
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