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A recantangular frame is to be suspende...

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 then tension will be minimum :

A

the same in all cases

B

least in (i)

C

least in(ii)

D

least in (iii)

Text Solution

Verified by Experts

The correct Answer is:
C
Let M be the mass of rectangular frame and `theta` be the angle which the tension T in the string makes with the horizontal as shown in the figure.
`:. " " 2T sintheta=Mg`
or `T=(Mg)/(2sintheta)`
or `Tinfty(1)/(sintheta)`
T is least if `sintheta` has maximum value i.e., `sintheta = 1 = sin90^(@)`. Thus optoin (c) is correct.
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