A rectangular frame is to be suspended symmetrically by two strin… - Vidyadip

MCQ

A rectangular frame is to be suspended symmetrically by two strings of equal length on two supports. It can be done in one of the following three ways;

The tension in the strings will be

A
The same in all cases.
B
Least in (a).
✓
Least in (b).
D
Least in (c).

✓

Answer

Correct option: C.

Least in (b).

According to the FBD diagram of the rectangular frame. Let M be the mass of rectangular frame and 0be the angle which the tension T in the string makes with the horizontal

Balancing vertical forces,
$2\text{T}\sin\theta-\text{mg}=0$ [T is tension in the string]
$\Rightarrow2\text{T}\sin\theta=\text{mg}$
Total horizontal force will be zero because of equal and opposite forces balance each other $(\text{T}\cos\theta).$
Now from Eq. (i), $\text{T}=\frac{\text{mg}}{2\sin\theta}$
Here, we know mg is constant.
$\Rightarrow\text{T}\propto\frac{1}{\sin\theta}$
T is least if $\sin\theta$ has maximum value.
$\text{T}_\text{min}=\frac{\text{mg}}{2\sin\theta_\text{max}}\text{ (since,}\sin\theta_{\text{max}}=1)$
$\sin\theta_\text{max}=1\Rightarrow\theta=90^\circ$
So the correct option is option (c).
Hence, tension is least for the case (b).

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