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Two wires of different materials are used to hang a rod horizontally tied from two ends of the rod of length $2m$. At what distance should a weight be hung on the rod from Wire-1 so that equal stresses are produced on both the wires. Wire 1: cross -sectional area $= 10^{-3}m^{2}$. Young's modulus $= 2 \times 10^{11} N/m^2$ Wire 2 : cross -sectional area $= 2 \times 10^{-3} m^{2}$. Young's modulus $= 1 \times 10^{11} N/m^2$

\[\begin {array} {1 1} (a)\;1.33\;m \\ (b)\;1.49\;m \\ (c)\;0.8\;m \\ (d)\;0.55\;m \end {array}\]

1 Answer

Let the rod be AB and the weight be hung at 0. Let $AO=x$ and the $OB=2-x$
Let $T_1$ and $T_2$ be tension in the two wires.
By principle of moments
$T_1 \times OA=T_2 \times OB$
Also it is given that the two wires have same stress.
$\therefore \large\frac{T_1}{A_1}=\frac{T_2}{A_2}$
Where $A_1$ and $A_2$ are area of cross - sections.
$\qquad=\large\frac{10^{-3}}{2 \times 10^{-3}}=\frac{1}{2}$ -------(2)
From (1) and (2)
$\large\frac{1}{2} =\frac{2-x}{x}$
$x= 4-2x$
$3x= 4$
$\therefore x= \large\frac{4}{3}$
$\qquad= 1.33\; m$
Hence a is the correct answer.
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