The rods of length $L_1$ and $L_2$ are made of materials whose coefficients of linear expansion are $\alpha _1$ and $\alpha _2$ respectively. If the difference between the two length is independent of temperatures, then
The rods of length $L_1$ and $L_2$ are made of materials whose coefficients of linear expansion are $\alpha _1$ and $\alpha _2$ respectively. If the difference between the two length is independent of temperatures, then
- A
$\frac{{{L_1}}}{{{L_2}}} = \frac{{{\alpha _1}}}{{{\alpha _2}}}$
- B
$\frac{{{L_1}}}{{{L_2}}} = \frac{{{\alpha _2}}}{{{\alpha _1}}}$
- C
$L_1^2{\alpha _1} = L_2^2{\alpha _2}$
- D
$\alpha _1^2{L_1} = d_2^2{L_2}$
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