What will be the magnitude of electric field at point O as shown in the figure? Each side of the figure is l and perpendicular to each other?

Question

${1 \over {4\pi {\varepsilon _0}}}{q \over {{l^2}}}$

${1 \over {4\pi {\varepsilon _0}}}{q \over {(2{l^2})}}\left( {2\sqrt 2 - 1} \right)$

${q \over {4\pi {\varepsilon _0}{{(2l)}^2}}}$

${1 \over {4\pi {\varepsilon _0}}}{{2q} \over {2{l^2}}}\left( {\sqrt 2 } \right)$

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