A recantangular frame is to be suspended symmetrically by two strings of equal length on two supports (figure).It can be done in one of the following three ways:

Options

A. the same in all cases
B. least in (i)
C. least in (ii)
D. least in (iii)

Answer

C

Explanation

`2T sin theta - mg = 0` [`T` is tension in the string]
`rArr 2T sin theta = mg`
`T = (mg)/(2 sin theta)s`
`rArr T prop (1)/(sin theta)`
`T_("min") = (mg)/(2sin theta_("max"))` (Since, `sin theta_("max") = 1`)
`sin theta_("max") = 1 rArr theta = 90^(@)`