What will be the magnitude of electric field at point O as shown in figure? Each side of the figure is l and perpendicular to each other?
(1) \(\frac{1}{4\pi\varepsilon_0}\frac{q}{l^2}\)
(2) \(\frac{1}{4\pi\varepsilon_0}\frac{q}{(2l^2)}(2\sqrt{2}-1)\)
(3) \(\frac{q}{4\pi\varepsilon_0(2l)^2}\)
(4) \(\frac{1}{4\pi\varepsilon_0}\frac{2q}{2l^2}(\sqrt{2})\)
