question_answer

Four particles each of mass m are placed at the corners of a square of side length l. The radius of gyration of the system about an axis perpendicular to the square and passing through its centre is:

A)  \[\frac{l}{\sqrt{2}}\]                                      

B)  \[{{l}_{2}}\]

C)  \[l\]                                      

D)  \[\sqrt{2}l\]