Torque croated due to weight of streat light remains
same in all the three cases. 9t is balanced by
torque created by tension in the string. So if γ
be the torque created by weight of lamp and T '
be tension in the string and ' d ' be perpendicular
distance of cable from the axis thou,
τ=T⋅d
Tension will be least for laxgest'd'. This is
in pattern A is more sturdy.