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As shown above, three charges of equal magnitude are placed at corners of a square of side length $L$.

Which one of the following is a correct expression for the magnitude of the net electric force acting on ${ q }_{ 2 }$?

A

$\cfrac{\sqrt { 2 } k{ Q }^{ 2 }}{{ L }^{ 2 }}$

B

$\cfrac{ { 2 } k{ Q }^{ 2 }}{{ L }^{ 2 }}$

C

$\cfrac{ { 2 } k{ Q }^{ 2 }}{\sqrt{2}{ L }^{ 2 }}$

D

$\cfrac{ k{ Q }^{ 2 }}{{2 L }^{ 2 }}$

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