JEE Advanced Model Paper 11 with solutions for online practice

A particle of mass M is attached to four springs each of unstretched length l asshown. Initial tension in each spring is F0 . The period of small oscillations of theparticle along a line Perpendicular to the plane containing the springs is 2 √

Ml

NF0

. What is ‘N’? (Neglect effect of gravity and assume that the additional forcedeveloped in springs due to displacement is much smaller than the original tension F0)